Lecture 17

Lecture 17 - Rocks Formed by Chemical Reactions Setting...

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Unformatted text preview: Rocks Formed by Chemical Reactions Setting Rock Salt Setting Travertine (limestone) 07.06.a Rocks Formed by Organisms 07.06.a Setting Limestone with fossils Setting Coal Other Nonclastic Sedimentary Rocks Gypsum Chalk Dolostone Chert 07.06.b Carbonate Rocks and Their Environments Limestone Limestone w/ fossils Dolostone Carbonate Rocks in Landscape Limestone Limestone Soluble limestone Dissolved Dissolved 07.11.d Time 1 Beach sand Observe what happens Observe when seas move in when Time 2 Mud over Mud sand sand Limestone Mudstone Sandstone Older units Section Section formed during a transgression transgression 07.12.a Time 3 Reef Limestone Limestone over mud over Time 1 Beach sand Beach over mud over Observe what happens Observe when seas move out when Time 2 Mud over Mud limestone limestone Time 3 Sandstone Mudstone Limestone Section Section formed during a regression regression 07.12.b Dune sand Why Sedimentary Layers End Limit of environment Limit (facies) (facies) Deposited in Deposited channel channel 07.12.m Indicators of Environment Color of rocks Size, shape, sorting Thickness of bedding Type of bedding Mudcracks Fossils 07.13.a Resources in Sedimentary Rocks Groundwater Petroleum Coal Cement from Cement limestone limestone Salt Uranium 07.14.a Studying History of Sedimentary Rocks Present key to past Past environments Past climate Past events Sequence of events Ancient life 07.14.b I-70 I-70 roadcut roadcut Observe the sedimentary units Observe west of Denver, Colorado west 07.15.a Dakota Dakota Hogback Hogback Red Rocks Amphitheater 07.15.c1 Observe these maps Observe depicting some of Colorado’s geologic history geologic Late Paleozoic Late Mesozoic Early to Middle Early Mesozoic Mesozoic 07.15.c Investigation: Observe Investigation: these sequences of sedimentary rocks in order to reconstruct the history history Locality 1: Top Locality part of sequence part Locality 2: Lower Locality part of sequence part 07.16.a 07.16.b1 Observe this sequence of sedimentary layers Sandstone, mudstone, coal Medium to dark gray Medium shale with fossil marine organisms organisms Sandstone with marine Sandstone shells shells Sedimentary units with Sedimentary fossilized wood and dinosaur tracks dinosaur 07.16.b ...
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