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The AAPG/Datapages Combined Publications Database

Utah Geological Association


Central Utah: Diverse Geology of a Dynamic Landscape, 2007
Pages 467-482

A Review of the Cretaceous Floras of East-Central Utah and Western Colorado

William D. Tidwell, Brooks B. Britt, Leith S. Tidwell


Modern, angiosperm-dominated floras in Utah and Colorado, like the rest of the world, had their beginning in the Cretaceous. Conifers, cycadeoids, and ferns, such as Tempskya, are dominant plant forms in the Early Cretaceous Cedar Mountain and Burro Canyon Formations of Utah and Colorado. However, angiosperms (flowering plants), appearing early in these formations, had by the Late Cretaceous become the dominant plants. Angiosperms, along with ferns, are prominent in the Dakota Formation and became the major component of the floras that grew in and around the Late Cretaceous coal swamps, such as those recorded in the Star Point and Blackhawk Formations. An abundance of dinosaur tracks are exposed in the roofs of coal mines in these formations. Dinosaurs trampling the peat while foraging formed these tracks.

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