Antelope Island at Great Salt Lake, Utah

Viola Limestone, North Limb Arbuckle Anticline, Oklahoma

Cimarron River, Oklahoma (July 23-27, 2014)

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Open-pit sand quarry in the Ordovician-age Oil Creek Formation, Oklahoma. The sandstone is relatively unconsolidated and is mined with water sprayed from a hose! This quarry produces some of the most uniformly sized, pure quartz sand in North Americ
View of Castle Rock (left, in distance) on South Table Mountain (August 22, 2015). Two prominent basalt flows (62-64 Ma) are exposed at the crest of the "table". Note people for scale (on precipice, right foreground). || #basalt #geology #g
Emergent sandbars ("imbricated" sand waves) following a major rainfall event in a meandering portion of the Cimarron River (August 19, 2012). || #scenery #science #landscape #biology #geology #geography #nature #geomorphology #geologist #p
Cretaceous-age Inoceramus bivalve shell cut perfectly by a vertical core in the Eagle Ford Shale near Waco, Texas. || #shale #geology #geography #geomorphology #geologist #eagleford #pattern #science #scenery #burrow #trace #fossil #colorado #oklahom
Sunrise through mist on the Missouri River, New Haven, Missouri - II. ...along the Lewis and Clark Trail (October, 2013; B/W image). || #geology #geologist #geomorphology #geography #biology #physics #chemistry #hydrology #engineering #math #missouri
North bank of the Missouri River at Portland, Missouri...along the Lewis and Clark Trail (October, 2013; B/W image). || #geology #geologist #geomorphology #geography #biology #physics #chemistry #hydrology #engineering #math #missouri #river #oklahom
Snow and ice on Pennsylvanian-age Fountain Formation sandstone at Red Rocks Park/Amphitheater - III. A reminder that winter will soon be upon us! Note trees for scale. || #colorado #fountain #geology #geologist #geomorphology #art #science #scenery #
Outbuilding on abandoned farm in Forgotten Valley, Golden Gate Canyon State Park, Colorado. Most of the surrounding bedrock is Precambrian granite. || #colorado #statepark #goldengate #canyon #geology #geologist #biology #physics #chemistry #instagoo
View to the north of the Colorado Front Range from Mount Galbraith, Golden, Colorado. The surrounding bedrock is Precambrian granite, schist, and gneiss. || #colorado #mountains #galbraith #goldengate #canyon #geology #geologist #biology #physics #ch
Cross-section view of yesterday's post showing differential compaction of black shale and chert beds around phosphate nodules (Upper Devonian / Lower Mississippian Woodford Shale, Oklahoma). The Woodford is a significant hydrocarbon source rock in No
Burrow network on the base of a bed in the Upper Devonian / Lower Mississippian Woodford Shale, Oklahoma. Phosphate nodules have grown at the end of many of the burrows. Scale: white marks on staff are 10 centimeters apart. The Woodford is a signific
Just After Sunset - II, Cimarron River, Oklahoma (August 13, 2012). A heron is visible in the middle distance! || #cimarron #river #oklahoma #kansas #newmexico #texas #colorado #science #scenery #landscape #instagood #nature #pattern #physics #chemis
Abandoned Farm in Forgotten Valley, Golden Gate Canyon State Park, Colorado. Most of the surrounding bedrock is Precambrian granite. || #colorado #statepark #goldengate #canyon #geology #geologist #biology #physics #chemistry #instagood #art #hydrolo
View of Castle Rock on South Table Mountain just after sunset (August 22, 2015). Two prominent basalt flows (62-64 Ma) are exposed at the crest of the hill or "table". Note people (on top) for scale! || #basalt #geology #geography #geomorph
Geologists debating significance of aquifer properties exposed in outcrop, South Africa (Summer, 2001). Opportunity for geologists to collegially debate their science in the field is a unique aspect of geology! || #southafrica #geology #geologist #zo
Colorado Supermoon at Sunrise! (August 30,2015) || #moon #super #supermoon #geology #geologist #geomorphology #geography #physics #chemistry #biology #hydrology #instagood #science #scenery #landscape #colorado #texas #newmexico #oklahoma #kansas #ar