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FOSSILS IN SEDIMENTARY ROCKS

FOSSILS IN SEDIMENTARY ROCKS. Most fossils are preserved in sedimentary rocks Trilobite in sandstone Fern in shale Bivalves shells in limestone. BEDDING OF SEDIMENTARY ROCKS.

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FOSSILS IN SEDIMENTARY ROCKS

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  1. FOSSILS IN SEDIMENTARY ROCKS • Most fossils are preserved in sedimentary rocks • Trilobite in sandstone • Fern in shale • Bivalves shells in limestone

  2. BEDDING OF SEDIMENTARY ROCKS • Sedimentary rocks are characterized by horizontal layers formed as changes occurred in grain sizes, composition, sedimentary structures, colour, etc. • Many sedimentary structures occur in these beds Canyonlands, Utah Grand Canyon

  3. SEDIMENTARY STRUCTURES • Ripples formed by air & water currents • Cross bedding inside the ripples & dunes

  4. SEDIMENTARY STRUCTURES • Mudcracks form when sediments dry out & shrink

  5. SEDIMENTARY STRUCTURES • Ancient coral reefs in limestones are giant sedimentary structures Permian reef of west Texas

  6. Sedimentary Stories - waiting to be told...

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