Plate Tectonics and the Rock Layers of Grand ... - Gsenmschool.org
Plate Tectonics and the Rock Layers of Grand ... - Gsenmschool.org
Plate Tectonics and the Rock Layers of Grand ... - Gsenmschool.org
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Gr<strong>and</strong> Staircase-Escalante National Monument Geology Unit 2<br />
Student Activity<br />
II. Moenkopi Formation – Trm<br />
Time formed<br />
<strong>Rock</strong><br />
Location<br />
Appearance:<br />
Special features<br />
Environment when<br />
formed<br />
Similar modern day<br />
habitats<br />
Missing rock layers<br />
~245 mya, Mesozoic/Early Triassic<br />
Limestone, shale, siltstone, <strong>and</strong> s<strong>and</strong>stone<br />
Sou<strong>the</strong>rn <strong>and</strong> eastern part <strong>of</strong> <strong>the</strong> Monument<br />
Red brown to brown; 440 to 1150 feet; cliff <strong>and</strong> slope-forming. The<br />
upper red member forms <strong>the</strong> lower part <strong>of</strong> <strong>the</strong> Chocolate Cliffs.<br />
These cliffs are not particularly prominent inside <strong>the</strong> Monument.<br />
Ripple marks, mud cracks, terrestrial <strong>and</strong> marine fossils; amphibian<br />
<strong>and</strong> reptile track ways (not dinosaurs), uranium <strong>and</strong> gold deposits<br />
are present though better represented in <strong>the</strong> Chinle formation.<br />
Coastal tidal flats. The shoreline shifted back <strong>and</strong> forth, giving a mix<br />
<strong>of</strong> shallow sea <strong>and</strong> arid coastal deposits. Daily tides created ripple<br />
marks. Utah lay close to <strong>the</strong> equator at this time.<br />
Persian Gulf<br />
Ano<strong>the</strong>r unconformity in <strong>the</strong> rock sequence occurs here.<br />
5
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