Ch42 — Glossary

How this file works: Terms are added incrementally as each chapter passes through the pipeline. Every technical term, place-specific term, or specialized concept used in the encyclopedia appears here with a plain-language definition and a cross-reference to the chapter where it first appears or is most fully explained. Terms are alphabetical within thematic sections.

Last incorporated: Ch01–Ch19 (2026-04-25)

ℹ️ Note: Terms from Ch04–Ch19 were incorporated 2026-04-25. New terms for Ch04–Ch07 and Ch05 flora have been added to existing sections §42.1–42.5; Ch08–Ch19 archaeological, cultural, and historical terms are grouped in the new §42.6.

---

42.1 Geologic Terms

Alfisol — A soil order characterized by clay-enriched subsoil layers under deciduous or mixed forests. In Emery County, Alfisols occur at higher elevations on the Wasatch Plateau under conifer forests. (Ch01 §1.8)

Alluvial fan — A fan-shaped deposit of sediment built up where a stream exits a narrow canyon onto a broader plain. Buckhorn Draw and Little Wild Horse feature classic examples. (Ch01 §1.11)

Anticline — An arch-shaped fold in layered rock, with the oldest strata at the center. The San Rafael Swell is one of the largest exposed anticlines on the Colorado Plateau. (Ch01 §1.6; Ch02 §2.7)

Aridisol — The dominant soil order in Emery County’s low-elevation basins: thin topsoil over carbonate-rich subsoils formed under arid conditions. (Ch01 §1.8)

Conglomerate — A sedimentary rock composed of rounded pebbles, cobbles, or boulders cemented in a finer matrix. The Shinarump Conglomerate (Chinle Formation) and Buckhorn Conglomerate (Cedar Mountain Formation) are important Emery County examples. (Ch02 §2.4, §2.6)

Cross-bedding — Inclined layers within a rock unit, formed by wind or water depositing sediment on the slip faces of dunes or ripples. Spectacular cross-bedding is visible in the Navajo and Coconino sandstones. (Ch02 §2.3, §2.5)

Desert pavement — A surface layer of tightly packed pebbles and stones, formed as wind removes finer sediment. Found on benches near Ferron and Huntington. (Ch01 §1.10)

Entisol — A young soil with little profile development, common on slopes and recently deposited surfaces in Emery County. (Ch01 §1.8)

Eolian (aeolian) — Formed or deposited by wind. The Navajo Sandstone and Entrada Sandstone are eolian deposits; modern sand dunes near Roberts Roost Flats are active eolian features. (Ch01 §1.10; Ch02 §2.5)

Evaporite — A sedimentary deposit formed by the evaporation of saline water, including salt, gypsum, and potash. The Paradox Formation contains thick evaporite sequences. (Ch02 §2.3)

Formation — The basic unit of rock classification in stratigraphy: a body of rock with consistent characteristics that can be mapped across a region. (Ch02 §2.1)

Hogback — A narrow, steeply tilted ridge formed by the erosion of dipping resistant rock layers. The San Rafael Reef is a hogback of Navajo and Wingate sandstones. (Ch01 §1.7; Ch02 §2.7)

Hoodoo — A tall, thin column of rock formed by differential weathering of layers with varying hardness. Goblin Valley’s hoodoos form in the Entrada Sandstone. (Ch02 §2.5)

Hypsometry — The measurement of elevation distribution across a landscape. Hypsometric analysis reveals that ~50% of Emery County lies between 5,000 and 8,000 ft. (Ch01 §1.5)

Inceptisol — A moderately developed soil, more mature than an Entisol but lacking the clay enrichment of an Alfisol. Found on pinyon-juniper slopes. (Ch01 §1.8)

Karst — A landscape formed by the dissolution of soluble rocks (limestone, dolomite) by slightly acidic water, producing sinkholes, caves, and underground drainage. Occurs along the Wasatch Plateau margin in Emery County. (Ch01 §1.9)

Laccolith — A mushroom-shaped igneous intrusion that domes the overlying strata without breaking through to the surface. Oligocene-Miocene laccoliths in Emery County produced localized copper mineralization. (Ch02 §2.8)

Laramide Orogeny — A period of mountain-building (roughly 70–40 Ma) caused by the shallow subduction of the Farallon Plate beneath North America. Created the San Rafael Swell and the Rocky Mountains. (Ch01 §1.6; Ch02 §2.7)

Loess — Fine-grained, wind-deposited silt. Thin loess deposits on lee slopes near Castle Dale support distinctive vegetation. (Ch01 §1.10)

Mollisol — A soil order with a thick, dark, organic-rich surface layer, formed under grasslands or meadows. Found at the highest elevations on the Wasatch Plateau. (Ch01 §1.8)

Monocline — A step-like bend in otherwise horizontal rock layers. The San Rafael Swell’s flanks are monoclinal folds. (Ch01 §1.6; Ch02 §2.7)

Paleoflood terrace — A bench of sediment preserved above a modern stream channel, recording the level of ancient floods. Terraces up to 15 ft above modern channels line the Price and San Rafael rivers. (Ch01 §1.11)

Roll-front mineralization — A process by which uranium is concentrated along a chemical boundary in permeable rock as groundwater moves through organic-rich sediments. The mechanism behind uranium deposits in the Chinle Formation. (Ch02 §2.4)

Sabkha — A flat, salt-encrusted coastal plain in an arid environment. The Entrada Sandstone preserves ancient sabkha deposits. (Ch02 §2.5)

Sodium adsorption ratio (SAR) — A measure of sodium concentration relative to calcium and magnesium in soil or water. Elevated SAR on alluvial fans indicates saline conditions affecting agriculture. (Ch01 §1.8)

Stratigraphic column — A diagram showing the vertical sequence of rock units in a region, arranged from oldest (bottom) to youngest (top). (Ch02 §2.1)

Unconformity — A gap in the geologic record where rock layers were eroded or never deposited, representing missing time. The Moenkopi-Chinle contact is an unconformity. (Ch02 §2.4)

Ventifact — A rock shaped and polished by windblown sand. Found on desert pavements at Temple Mountain bench. (Ch01 §1.10)

Terms added from Ch04–Ch07 and Ch17 sourcing pass (2026-04-25):

Arroyo — A steep-walled, flat-floored gully or dry streambed that carries runoff during storm events. Common throughout the San Rafael Swell and Castle Valley. (Ch04 §4.7)

Carnotite — A radioactive yellow uranium-vanadate mineral [K₂(UO₂)₂(VO₄)₂·3H₂O]; the primary ore mineral mined at Temple Mountain and other Emery County uranium deposits. Associated with organic material in Chinle Formation sediments. (Ch17 §17.3)

Cuesta — An asymmetric ridge with one long, gently sloping surface (dip slope) and one short, steeply scarped face (escarpment). The Book Cliffs and much of the San Rafael Swell perimeter display cuesta topography. (Ch01 §1.3; Ch02 §2.7)

Orographic effect — Enhanced precipitation produced when air masses are forced upslope over a mountain barrier, cooling adiabatically and releasing moisture. The Wasatch Plateau’s 40+ inches of annual snowfall is largely orographic. (Ch04 §4.2)

Vanadium — A steel-gray transition metal (V) found in uranium ore deposits; historically mined alongside uranium in Emery County’s Chinle Formation deposits. Used in steel alloys and, more recently, vanadium-flow batteries. (Ch17 §17.3)

---

42.2 Hydrologic & Water Terms

Acre-foot (af) — The volume of water that would cover one acre to a depth of one foot; approximately 325,851 gallons. Used to measure reservoir capacity and water rights. (Ch03 §3.8)

Aquifer — An underground layer of permeable rock or sediment that holds and transmits groundwater. The Colorado Plateau aquifer system underlies much of Emery County. (Ch03 §3.3)

Appropriation (water rights) — The legal right to divert and use a specific quantity of water, established under Utah’s prior-appropriation doctrine (“first in time, first in right”). (Ch03 §3.9)

Diversion — A structure or channel that redirects water from a natural stream to a canal or pipeline for irrigation or municipal use. (Ch03 §3.8, §3.9)

Dissolved solids (TDS) — The total concentration of minerals, salts, and metals dissolved in water, measured in milligrams per liter (mg/L). Green River water at the Emery County diversion averages 357 mg/L; agricultural return flows reach 4,170 mg/L. (Ch03 §3.6)

Discharge — The volume of water flowing past a point per unit of time, typically measured in cubic feet per second (cfs). (Ch03 §3.1, §3.2)

Ephemeral stream — A waterway that flows only during or immediately after precipitation events. Many Emery County washes — Little Wild Horse, Buckhorn Wash — are ephemeral. (Ch01 §1.4; Ch03)

Flash flood — A sudden, powerful surge of water through a normally dry channel, typically triggered by intense thunderstorms. A significant hazard in the San Rafael Swell’s slot canyons. (Ch02 §2.12; Ch03 §3.7)

Hanging garden — A lush assemblage of ferns, mosses, and wildflowers growing on a seep-fed cliff face, typically where a permeable sandstone layer meets an impermeable shale. Found in the San Rafael Swell. (Ch03 §3.5)

HUC-12 — A 12-digit Hydrologic Unit Code identifying a specific sub-watershed in the USGS watershed classification system. Emery County contains numerous HUC-12 units. (Ch01 §1.4)

Return flow — Water that re-enters a stream or aquifer after being diverted for irrigation, often carrying elevated dissolved solids from soil leaching. (Ch03 §3.6)

Salt loading — The process by which irrigation water dissolves salts from soil and rock and carries them into streams. Emery County contributes an estimated 15,700 tons/year of salt loading to the Green River. (Ch03 §3.6)

Seepage — The slow movement of water through soil or along canal beds. Canal seepage losses are a significant concern in Emery County’s irrigation infrastructure. (Ch03 §3.8)

Snowpack — Accumulated snow on the ground, measured as snow water equivalent (SWE). Approximately 95% of Utah’s water supply originates as snowpack. The Wasatch Plateau snowpack is Emery County’s primary water source. (Ch03 §3.11)

Spring — A natural point where groundwater reaches the surface. Emery County’s springs range from high-elevation perennial springs on the Wasatch Plateau to desert seeps in the San Rafael Swell. (Ch03 §3.4)

Terms added from Ch04 and Ch19 sourcing pass (2026-04-25):

Colorado River Compact (1922) — An interstate compact signed November 24, 1922, apportioning the Colorado River’s average annual flow of 15 million acre-feet between the Upper Basin (Colorado, New Mexico, Utah, Wyoming) and Lower Basin (Arizona, California, Nevada) states at 7.5 maf each. Governs Emery County’s water development rights. (Ch19 §19.3)

Consumptive use — The portion of water diverted from a stream or aquifer that is not returned to the source — lost to evapotranspiration, plant uptake, or incorporation into products. Distinguished from total diversions by the amount of return flow. (Ch19 §19.5)

North American Monsoon — A seasonal shift in atmospheric circulation that draws moisture northward from the Gulf of California and Gulf of Mexico into the Intermountain West each summer (typically July–September), producing Emery County’s characteristic afternoon and evening thunderstorms. (Ch04 §4.4)

Palmer Drought Severity Index (PDSI) — A standardized measure of surface moisture balance derived from temperature, precipitation, and soil capacity data. Used to quantify drought severity relative to historical norms; Emery County has experienced a trend toward more negative PDSI values since 1950. (Ch04 §4.11)

Snow-water equivalent (SWE) — The depth of liquid water that would result from melting a given snowpack; the standard measure of snowpack water storage. Emery County’s primary mountain SNOTEL stations track SWE from October through May. (Ch04 §4.2)

Transbasin diversion — The conveyance of water from one river basin into another through tunnels, pipelines, or canals. The Strawberry Aqueduct diverts Colorado River Basin water into the Bonneville Basin; portions of that water ultimately reach Emery County irrigation users. (Ch19 §19.4)

---

42.3 Geologic Formations (Emery County)

Listed from oldest to youngest. See Ch02 for full descriptions.

Hermosa Group (Pennsylvanian) — Marine carbonates and evaporites; includes the Paradox Formation (salt, potash, oil) and Honaker Trail Formation. Oldest rocks exposed in the San Rafael Swell interior. (Ch02 §2.3)

Coconino Sandstone (Permian) — Massive cross-bedded eolian sandstone, up to 715 ft thick. Preserved ancient sand dunes. (Ch02 §2.3)

Kaibab Limestone (Permian) — Marine limestone capping the Paleozoic section. Records the last Permian sea transgression. (Ch02 §2.3)

Moenkopi Formation (Triassic) — Reddish-brown mudstones with ripple marks and mudcracks. Forms the “chocolate ledges” around the San Rafael Swell. (Ch02 §2.4)

Chinle Formation (Triassic) — Colorful shales and conglomerates; includes the Shinarump Conglomerate, principal uranium ore host. Petrified wood common. (Ch02 §2.4)

Wingate Sandstone (Jurassic) — Sheer, rust-red cliff-forming eolian sandstone. (Ch02 §2.5)

Kayenta Formation (Jurassic) — Thin-bedded fluvial sandstones between the Wingate and Navajo. (Ch02 §2.5)

Navajo Sandstone (Jurassic) — Up to 2,000 ft of cross-bedded eolian sandstone. Forms slot canyon walls throughout the San Rafael Swell. (Ch02 §2.5)

Carmel Formation (Jurassic) — Marine limestones, siltstones, and gypsum from northern sea incursions. (Ch02 §2.5)

Entrada Sandstone (Jurassic) — Eolian and sabkha sandstone; forms Goblin Valley’s hoodoos. (Ch02 §2.5)

Morrison Formation (Jurassic) — Fluvial mudstones and sandstones; host rock of the Cleveland-Lloyd Dinosaur Quarry. 148–155 Ma. (Ch02 §2.5)

Cedar Mountain Formation (Cretaceous) — Variegated mudstones and sandstones; includes the Short Canyon Member and Buckhorn Conglomerate. (Ch02 §2.6)

Dakota Sandstone (Cretaceous) — Beach and nearshore sandstone marking the initial Western Interior Seaway transgression. (Ch02 §2.6)

Mancos Shale (Cretaceous) — Thick gray marine shale; includes the Ferron Sandstone Member and the Emery Sandstone Member (named for Emery County). (Ch02 §2.6)

Star Point Sandstone (Cretaceous) — Shoreface sandstone of the retreating Western Interior Seaway. (Ch02 §2.6)

Blackhawk Formation (Cretaceous) — Delta-plain and back-barrier deposits; host of Emery County’s coal seams. (Ch02 §2.6)

North Horn Formation (Cretaceous–Tertiary) — Fluvial and lacustrine deposits; notably prone to large-scale landslides. (Ch02 §2.8)

Green River Formation (Eocene) — Lacustrine deposits of ancient Lake Uinta; contains oil shale (kerogen). (Ch02 §2.8)

---

42.4 Geographic & Place Terms

Basin and Range Province — The physiographic province west of the Colorado Plateau, characterized by alternating mountain ranges and desert valleys formed by crustal extension. The western margin of Emery County shows Basin and Range influence. (Ch01 §1.2)

Book Cliffs — A major sandstone escarpment extending across northern Emery County, marking the edge of the Tavaputs Plateau. (Ch01 §1.2, §1.3)

Colorado Plateau — A vast region of relatively undeformed, flat-lying sedimentary rocks covering parts of Utah, Colorado, Arizona, and New Mexico. Emery County lies on its western margin. (Ch01 §1.2; Ch02 §2.1)

PLSS (Public Land Survey System) — The rectangular grid system used to describe land ownership in the western United States, based on townships, ranges, and sections tied to a principal meridian and baseline. Emery County’s boundaries are defined by PLSS lines tied to the Salt Lake Meridian. (Ch01 §1.1)

San Rafael Reef — The steeply tilted eastern limb of the San Rafael Swell, forming a dramatic wall of Navajo and Wingate sandstone hogbacks visible from I-70. (Ch02 §2.7)

San Rafael Swell — A massive dome-shaped anticline (~75 × 40 miles) in Emery County, exposing rocks from the Pennsylvanian to the Cretaceous. The county’s defining geologic and geographic feature. (Ch01 §1.7; Ch02 §2.7)

Tavaputs Plateau — The elevated tableland north of the Book Cliffs in northern Emery County. (Ch01 §1.2)

Wasatch Plateau — The high, forested plateau along Emery County’s western boundary, reaching over 10,700 ft. The county’s primary water source. (Ch01 §1.3; Ch03 §3.1)

Western Interior Seaway — A shallow ocean that split North America from the Gulf of Mexico to the Arctic during the Late Cretaceous (~95–70 Ma). Its deposits form the Mancos Shale and Mesaverde Group. (Ch02 §2.6)

---

42.5 Biological & Ecological Terms

Colorado pikeminnow (Ptychocheilus lucius) — North America’s largest native minnow, federally listed as endangered (1967/1973). Found in the Green River through Emery County. (Ch03 §3.10)

Fremont cottonwood (Populus fremontii) — The dominant riparian tree along Emery County’s streams and rivers. (Ch01 §1.4)

Narrowleaf willow (Salix exigua) — A shrub-form willow common in riparian corridors. (Ch01 §1.4)

Razorback sucker (Xyrauchen texanus) — A large native sucker fish, federally listed as endangered (1991). Found in the Green River. (Ch03 §3.10)

Terms added from Ch05–Ch07 sourcing pass (2026-04-25):

Biological corridor — A strip of suitable habitat connecting otherwise isolated wildlife populations, enabling movement, dispersal, and genetic exchange. The Green River serves as a critical biological corridor through Emery County. (Ch06 §6.7)

Bortle scale — A nine-level numerical scale measuring the darkness of the night sky at a given location, from Bortle 1 (darkest) to Bortle 9 (inner-city skyglow). Goblin Valley State Park has achieved Bortle 2 certification. (Ch07 §7.3)

Cheatgrass (Bromus tectorum) — An invasive annual grass from Eurasia that has colonized millions of acres of sagebrush steppe in the Intermountain West. Cheatgrass creates dense, early-senescing fine fuels that increase fire frequency and hinder native perennial recovery. (Ch05 §5.12)

Cryptobiotic soil crust — A living community of cyanobacteria, green algae, microfungi, lichens, and mosses forming a thin, fragile mat on arid soil surfaces. It stabilizes soil against wind and water erosion, fixes atmospheric nitrogen, and retains moisture. Extremely vulnerable to foot and vehicle traffic. (Ch05 §5.2)

Dark sky park — A designation by DarkSky International (formerly the International Dark-Sky Association) recognizing sites with exceptional nighttime environments and commitment to preserving natural darkness. Goblin Valley State Park is a certified Dark Sky Park. (Ch07 §7.6)

Halophyte — A plant adapted to grow in soils or waters with high salt concentrations. Emery County’s salt-desert shrubs — shadscale (Atriplex confertifolia), greasewood (Sarcobatus vermiculatus), and fourwing saltbush (Atriplex canescens) — are halophytes. (Ch05 §5.2)

Krummholz — Stunted, wind-pruned trees growing at or near the alpine timberline, shaped by persistent winds and ice abrasion. From the German for “crooked wood.” Found on exposed Wasatch Plateau ridges above ~10,500 ft. (Ch05 §5.7)

Light pollution — Artificial illumination that brightens the night sky, reducing visibility of stars and astronomical objects and disrupting nocturnal wildlife behavior and circadian rhythms. The Emery County night sky, rated Bortle 1–2 in most rural areas, is among the darkest in the lower 48 states. (Ch07 §7.1)

Mule deer (Odocoileus hemionus) — The most abundant large mammal in Emery County; managed through the San Rafael Herd Unit and related management plans. A keystone species for hunter-related recreation economy and ecosystem food web. (Ch06 §6.5)

Pronghorn (Antilocapra americana) — North America’s fastest land mammal, capable of sustained speeds of 55 mph. Native to open shrublands; Emery County supports a resident population. (Ch06 §6.6)

Riparian corridor — The vegetated zone along a stream, river, or other water body, characterized by species adapted to periodic flooding. Riparian corridors provide disproportionate biodiversity value relative to their area — typically <2% of Emery County land but supporting the majority of its species. (Ch05 §5.8)

Saltcedar (Tamarix ramosissima) — An invasive shrub introduced from Eurasia that colonizes riverbanks and spring seeps, consuming large quantities of water through transpiration, altering soil salinity, and displacing native cottonwood-willow communities. Active removal underway along Green River and Fremont River corridors. (Ch05 §5.12; Ch06 §6.8)

SGCN (Species of Greatest Conservation Need) — Designation in Utah’s Wildlife Action Plan for species identified as needing proactive conservation attention due to population trends, limited range, or habitat vulnerability. Emery County’s SGCN species include the Mexican spotted owl, loggerhead shrike, and sagebrush sparrow. (Ch06 §6.3)

SNOTEL (Snow Telemetry) — A network of automated remote snowpack monitoring stations operated by the NRCS, transmitting real-time snow-water equivalent, temperature, and precipitation data via satellite. The Fish Creek and Scofield SNOTEL stations are primary references for Emery County snowpack tracking. (Ch04 §4.2)

---

42.6 Human Geography, Archaeology & History Terms

Terms added from Ch08–Ch16 sourcing pass (2026-04-25):

Ancestral Puebloan — The preferred modern term for the prehistoric agricultural peoples of the Four Corners region (formerly “Anasazi”). Ancestral Puebloan sites in southeastern Emery County include cliff dwellings, granaries, and ceramic scatters dating from the Basketmaker II through Pueblo III periods (ca. 200 BC–AD 1300). (Ch08 §8.1)

Antiquities Act (1906) — The first U.S. federal law protecting prehistoric and historic sites on federal lands; authorized the president to designate national monuments. Remains the legal foundation for monument designations affecting Emery County lands. (Ch13 §13.1)

Archaeological Resources Protection Act (ARPA, 1979) — Federal law prohibiting excavation, removal, or damage to archaeological resources on federal or tribal lands without a permit; establishes criminal penalties for looting. (Ch13 §13.2)

Atlatl — A dart-throwing board or spear-thrower that extends the effective length of the arm, dramatically increasing projectile velocity and range. The primary hunting technology in the Great Basin and Colorado Plateau before the bow and arrow (which appeared ca. AD 500–700). (Ch08 §8.3; Ch09 §9.3)

Basketmaker culture — The early phase of Ancestral Puebloan development (ca. 1500 BC–AD 750), characterized by atlatl hunting, pit structures, distinctive twined basketry, and the absence of formal pottery in its earliest stages. (Ch08 §8.2)

Biface — A stone tool flaked on both faces, including hand axes, knives, and projectile point preforms. Common in Fremont and Archaic lithic assemblages across Emery County. (Ch09 §9.4)

Cooperative irrigation system — A community-owned and managed network of canals, headgates, and ditches built to deliver water from streams to agricultural fields. The organizing infrastructure of early LDS settlement in Emery County; most early towns incorporated as irrigation companies before formal county government was established. (Ch16 §16.4; Ch19 §19.2)

Coursed masonry — A construction technique using flat stone laid in horizontal rows (courses), often with mud mortar; associated with later Fremont and Ancestral Puebloan habitation sites in Emery County. (Ch08 §8.5)

Debitage — The waste flakes, shatter, and chips produced during stone tool manufacture. The presence of debitage identifies a site as a flintknapping location or workshop. (Ch09 §9.4)

Fremont culture — A prehistoric semi-sedentary archaeological tradition of the Colorado Plateau and eastern Great Basin (ca. AD 400–1350), defined by distinctive gray-ware pottery, clay figurines, trapezoidal anthropomorphic rock art, and one-rod-and-bundle basketry. The Fremont co-existed with and partly overlapped the Ancestral Puebloans. (Ch09 §9.1)

Fur trade era — The period (approximately 1820–1850) during which American and French-Canadian trappers explored the Green River system and its tributaries in search of beaver pelts for the European felt-hat market. Denis Julien’s signatures (1836–1844) are the oldest Euro-American inscriptions recorded in the Emery County canyon country. (Ch14 §14.3; Ch15 §15.1)

Granary — A small, dry-laid stone or adobe structure built in cliff alcoves or overhangs to store dried foodstuffs — corn, beans, squash, jerky. Granaries are among the most common Fremont and Ancestral Puebloan structural features in Emery County’s canyon lands. (Ch08 §8.4; Ch09 §9.2)

Homestead Act (1862) — Federal legislation that granted 160-acre parcels of public land to settlers who improved and occupied the land for five years and paid a modest filing fee. Drove much of Emery County’s agricultural settlement in the 1870s–1890s. (Ch16 §16.3)

Kiva — A subterranean or semi-subterranean circular ceremonial and social chamber used by Ancestral Puebloan peoples; characterized by a sipapu (symbolic entrance to the underworld), a hearth, deflector stone, and ventilator shaft. (Ch08 §8.5)

Lithic scatter — An archaeological site type consisting of flaked stone artifacts, debitage, and ground stone on or near the surface, with no associated structural remains. Common surface signature of short-term Archaic and Fremont campsites. (Ch09 §9.4)

Moki steps — Hand- and toe-holds cut into vertical cliff faces, enabling access to otherwise inaccessible ledges, alcoves, and rim-top routes. Named for the Hopi (historically called “Moki” by early settlers); found throughout the San Rafael Swell canyon country. (Ch08 §8.4)

NAGPRA (Native American Graves Protection and Repatriation Act, 1990) — Federal law requiring federal agencies and institutions receiving federal funds to inventory Native American cultural items in their collections and repatriate them to lineal descendants or culturally affiliated Indian tribes. (Ch13 §13.6)

National Register of Historic Places — The official U.S. list of districts, sites, buildings, structures, and objects significant in American history, architecture, archaeology, engineering, and culture. Administered by the National Park Service under the NHPA; numerous Emery County sites are listed or eligible. (Ch13 §13.4)

Numic expansion — The linguistic and demographic spread of Numic-speaking peoples (ancestors of the Ute, Paiute, and Shoshone) out of the southwestern Great Basin beginning approximately AD 1000–1300, ultimately occupying much of the Great Basin and parts of the Colorado Plateau. (Ch10 §10.1)

Numic languages — A branch of the Uto-Aztecan language family comprising three language pairs (Western, Central, and Southern Numic), including Paiute, Shoshone, Ute, Comanche, and Kawaiisu. The Ute people who historically occupied Emery County speak a Southern Numic language. (Ch10 §10.1)

Old Spanish Trail — A trade and travel route connecting Santa Fe, New Mexico, with Los Angeles, California, active approximately 1829–1848. The mountain branch of the trail passed through the Castle Valley corridor (present-day US-6/US-191) and crossed the Green River at a ford near present-day Green River town. (Ch14 §14.1)

Petroglyph — An image carved, incised, abraded, or pecked into rock using a harder stone tool; distinguished from pictographs by the removal (rather than application) of material. The San Rafael Swell contains thousands of Fremont and Archaic petroglyphs, with Nine Mile Canyon to the north one of the densest concentrations on the Colorado Plateau. (Ch12 §12.1)

Pictograph — A rock art image created by applying pigment (iron oxide, manganese, clay, plant-based dyes) to a rock surface. The Great Gallery in Canyonlands and the Black Dragon Canyon panel in the San Rafael Swell are prominent examples. (Ch12 §12.1)

Pithouse — A prehistoric dwelling type with walls partially or wholly below ground surface, entered through a roof hatch; reduces interior temperature variation in semi-arid climates. The principal Fremont domestic structure during the early occupation period (AD 400–900). (Ch09 §9.2)

Rock art — A collective term for all images and designs created on natural rock surfaces, including both petroglyphs (carved) and pictographs (painted). Emery County’s rock art corpus spans more than 8,000 years — from Archaic hunting scenes to Fremont anthropomorphs to historic Ute riders. (Ch12 §12.1)

Section 106 review — The regulatory process mandated by §106 of the National Historic Preservation Act, requiring federal agencies to identify historic properties in the area of potential effect of their undertakings and assess impacts before proceeding. BLM and other agencies conduct Section 106 review for any ground-disturbing project on federal lands in Emery County. (Ch13 §13.2)

Ute — A Numic-speaking people (Southern Numic branch) whose historic territory included the Wasatch Plateau, Book Cliffs, Green River canyon, and surrounding areas of present-day eastern Utah and western Colorado. The dominant Indigenous group in Emery County at Euro-American contact; ceded most territorial claims through the 1865 Spanish Fork Treaty and subsequent agreements. (Ch10 §10.4)

Ward (LDS) — In The Church of Jesus Christ of Latter-day Saints, the basic congregational unit led by a bishop, typically corresponding to a geographic community or neighborhood. Early Emery County settlements were organized as LDS wards before civil government was formalized, making ward boundaries functionally equivalent to town limits. (Ch16 §16.2)

---

Term Statistics

Statistic	Value
Total terms defined	126
Chapters incorporated	Ch01–Ch19
Geologic terms	33 (§42.1: 28 core + 5 new)
Hydrologic terms	20 (§42.2: 14 core + 6 new)
Formation entries	18
Geographic/place terms	9
Biological/ecological terms	18 (§42.5: 4 core + 14 new)
Human geography/archaeology/history terms	28 (§42.6: new section)

---

Next update: after Ch20+ chapters advance through pipeline.