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Mineral Resources > Online Spatial Data > Geology > by state > Utah Geology

Geologic units in Iron county, Utah

[Additional scientific data in this geographic area]

Triassic and Jurassic sedimentary rocks in southwestern Utah (Early to Middle Jurassic) at surface, covers 0.4 % of this area

Lithology: sandstone; siltstone; mudstone; limestone

Quaternary mud and salt flats (Holocene) at surface, covers < 0.1 % of this area

Lithology: mud flat; playa

Mississippian (1) carbonate rocks in western Utah (Mississippian) at surface, covers < 0.1 % of this area

Lithology: limestone

Cretaceous (1) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 0.7 % of this area

Lithology: sandstone; shale; conglomerate; coal

Tertiary (5) sedimentary rocks in southwestern Utah (Miocene to Pliocene) at surface, covers 2 % of this area

Lithology: sandstone; conglomerate

Tuffaceous sedimentary rocks (Late Eocene to Late Miocene) at surface, covers < 0.1 % of this area

TUFFACEOUS SEDIMENTARY ROCKS-Locally includes minor amounts of tuff

Lithology: sandstone; limestone; siltstone; conglomerate; mudstone; dolostone (dolomite); felsic volcanic rock; intermediate volcanic rock; mafic volcanic rock; tuff

Tertiary (4) sedimentary rocks in southwestern Utah (Miocene) at surface, covers 0.7 % of this area

Lithology: medium-grained mixed clastic; sandstone; conglomerate

Quaternary Lake Bonneville deposits (Quaternary) at surface, covers 3 % of this area

Lithology: clay or mud; sand; gravel; silt

Triassic and Jurassic sedimentary rocks in western Utah (Early Jurassic) at surface, covers < 0.1 % of this area

Lithology: sandstone

Cretaceous (3) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 0.7 % of this area

Lithology: fine-grained mixed clastic; siltstone

Oligocene volcanic rocks (Late Eocene to Oligocene) at surface, covers 8 % of this area

Lithology: dacite; rhyolite; andesite; basalt

Silurian carbonate rocks in western Utah (Silurian) at surface, covers < 0.1 % of this area

Lithology: dolostone (dolomite); chert

Triassic (1) sedimentary rocks in Salt southwestern Utah (Early Triassic) at surface, covers 0.2 % of this area

Lithology: mudstone; siltstone; limestone; sandstone; conglomerate; evaporite

Tertiary intrusive rocks in southwestern Utah (Oligocene to Miocene) at surface, covers 0.8 % of this area

Lithology: quartz monzonite; granite; monzonite

Older Quaternary alluvial deposits (Quaternary) at surface, covers 0.5 % of this area

Lithology: alluvium

Pliocene and Quaternary alluvial material (Pliocene to Quaternary) at surface, covers 0.2 % of this area

Lithology: alluvium

Quaternary basalts (Quaternary) at surface, covers 2 % of this area

Lithology: basalt; rhyolite

Cretaceous (2) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 4 % of this area

Lithology: sandstone; mudstone; black shale; coal

Tertiary (2) sedimentary rocks in southwestern Utah (Eocene) at surface, covers < 0.1 % of this area

Lithology: shale; limestone; oil shale; fine-grained mixed clastic; tuff

Andesite and related rocks of intermediate composition (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area

ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias

Lithology: andesite; trachyte; dacite

Miocene rhyolites (Middle to Late Miocene) at surface, covers 0.5 % of this area

Lithology: rhyolite; dacite

Permian (1) sedimentary rocks in southwestern Utah (Early Permian) at surface, covers < 0.1 % of this area

Lithology: sandstone; dolostone (dolomite); fine-grained mixed clastic

Tertiary intrusive rocks in western Utah (Late Eocene to Early Miocene) at surface, covers < 0.1 % of this area

Lithology: granodiorite; granite; quartz monzonite; quartz diorite

Ordovician sedimentary rocks in western Utah (Ordovician) at surface, covers < 0.1 % of this area

Lithology: limestone; fine-grained mixed clastic; sandstone; dolostone (dolomite)

Quaternary alluvium and colluvium (Quaternary) at surface, covers 46 % of this area

Lithology: alluvium; colluvium

Tertiary volcanic rocks, undivided (Tertiary) at surface, covers 9 % of this area

Lithology: volcanic rock (aphanitic)

Miocene basalts (Early to Middle Miocene) at surface, covers 0.3 % of this area

Lithology: basalt

Welded and nonwelded silicic ash-flow tuffs (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area

WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock

Lithology: rhyolite; dacite; trachyte

Alluvial deposits (Quaternary) at surface, covers < 0.1 % of this area

ALLUVIAL DEPOSITS-Locally includes beach and sand dune deposits

Lithology: alluvium; mass wasting; dune sand; lake or marine deposit (non-glacial)

Middle Cambrian shale and carbonate rocks in southwestern Utah (Middle Cambrian) at surface, covers < 0.1 % of this area

Lithology: dolostone (dolomite); argillite; limestone

Quaternary eolian deposits (Quaternary) at surface, covers 1 % of this area

Lithology: eolian

Jurassic (1) sedimentary rocks in southeastern Utah (Middle Jurassic) at surface, covers 0.7 % of this area

Lithology: sandstone; limestone; mudstone; evaporite

playa (Holocene) at surface, covers 0.2 % of this area

Lithology: playa

Pennsylvanian and Permian sedimentary rocks in southwestern Utah (Pennsylvanian) at surface, covers < 0.1 % of this area

Lithology: dolostone (dolomite); sandstone

Rhyolitic flows and shallow intrusive rocks (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area

RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS

Lithology: rhyolite; dacite; trachyte

Ash-flow tuffs and tuffaceous sedimentary rocks (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area

ASH-FLOW TUFFS AND TUFFACEOUS SEDIMENTARY ROCKS

Lithology: ash-flow tuff; rhyolite; sandstone; dacite; trachyte

Triassic (2) sedimentary rocks in southwestern Utah (Late Triassic) at surface, covers < 0.1 % of this area

Lithology: mudstone; conglomerate; siltstone

Devonian sedimentary rocks in western Utah (Devonian to Mississippian) at surface, covers < 0.1 % of this area

Lithology: dolostone (dolomite); limestone; siltstone; mudstone

Tertiary (1) sedimentary rocks in southwestern Utah (Late Paleocene to Early Oligocene) at surface, covers 3 % of this area

Lithology: limestone; mudstone; fine-grained mixed clastic; conglomerate; tuff

Quaternary landslides (Quaternary) at surface, covers 0.2 % of this area

Lithology: landslide

Miocene volcanic rocks (Late Oligocene to Middle Miocene) at surface, covers 14 % of this area

Lithology: ash-flow tuff; basalt

Upper Cambrian carbonate rocks in western Utah (Middle Cambrian to Early Ordovician) at surface, covers 0.3 % of this area

Lithology: limestone; dolostone (dolomite); shale