The Story in the Rocks How Rainbow Bridge Came to Be

At the dawn of the Triassic period, approxi mately 225 million years ago,* the region we know as the Colorado Plateau was markedly different in appearance from the way we see it today. The vast oceans, which covered the whole region during the middle Permian era, had finally retreated off to the sou...

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Bibliographic Details
Published inRainbow Bridge p. 11
Main Author Hassell, Hank
Format Book Chapter
LanguageEnglish
Published United States Utah State University Press 01.04.2001
University Press of Colorado
Subjects
Alluvial landforms
Alluvial plains
Bedforms
Canyons
Clastic sedimentary rocks
Dunes
Earth sciences
Erosional landforms
Floodplains
Flow structures
Fluvial landforms
Geochronology
Geography
Geologic time scale
Geology
Geomorphology
Highlands
History of the Americas
Landforms
Mesozoic era
Mud
Mudrocks
NATURAL HISTORY, COUNTRY LIFE & PETS
Petrology
Physical sciences
Plateaus
REFERENCE, INFORMATION AND INTERDISCIPLINARY SUBJECTS
Rocks
Sandstones
Sedimentary petrology
Sedimentary rocks
Sedimentary structures
Sediments
Shales
Tectonic landforms
Topography
Triassic period
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Summary:At the dawn of the Triassic period, approxi mately 225 million years ago,* the region we know as the Colorado Plateau was markedly different in appearance from the way we see it today. The vast oceans, which covered the whole region during the middle Permian era, had finally retreated off to the south and west, and so most of what is today southern Utah and northern Arizona was at last above the sea level. For the next 50 million years the region would remain as part of a large prehistoric continent, receiving in this period the rich and colorful sandstones
ISBN:0874212669
9780874212662
DOI:10.2307/j.ctt46nwq7.8