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 />
XI. Straight Cliffs Formation – Ks<br />
Time formed<br />
<strong>Rock</strong><br />
Appearance:<br />
Special features<br />
Environment when<br />
formed<br />
Similar modern day<br />
habitats<br />
Time formed<br />
<strong>Rock</strong><br />
Appearance:<br />
Special features<br />
Environment when<br />
formed<br />
Similar modern day<br />
habitats<br />
~ 85 mya, Mesozoic/ Late Cretaceous<br />
S<strong>and</strong>stone, shale with coal<br />
Yellow-gray, white; 900 to 1800 feet; cliff-forming, some slopes;<br />
comprises <strong>the</strong> Straight Cliffs located mostly in <strong>the</strong> northwest <strong>and</strong><br />
south central portions <strong>of</strong> <strong>the</strong> Monument.<br />
Coal seams, some burning underground (Smoky Mountain, Burning<br />
Hills); “clinker” rocks formed by natural coal fires.<br />
Coastal swamps, warm lagoons, marshy seashores. Vast amounts <strong>of</strong><br />
<strong>org</strong>anic material, mostly plants created perfect conditions for coal<br />
formation.<br />
Delta <strong>and</strong> coast <strong>of</strong> Louisiana.<br />
XII. Wahweap Formation – Kw<br />
~80 mya, Mesozoic/Late Cretaceous<br />
S<strong>and</strong>stone, shale, mudstone<br />
Yellowish-gray, buff; 800 to 1100 feet; top two members form cliffs<br />
<strong>and</strong> ledges, its third <strong>and</strong> lowest member form slopes. It is best<br />
represented in <strong>the</strong> eastern part <strong>of</strong> <strong>the</strong> Monument.<br />
Fossils, dramatic cliffs.<br />
Swampy lowl<strong>and</strong>s. These were lush, humid areas with<br />
floodplains, slow rivers, <strong>and</strong> shallow lakes.<br />
Inl<strong>and</strong> Louisiana<br />
12
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