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

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Page 1: FOSSILS IN SEDIMENTARY ROCKS Most fossils are preserved in sedimentary rocks –Trilobite in sandstone –Fern in shale –Bivalves shells in limestone

FOSSILS IN SEDIMENTARY ROCKS• Most fossils are preserved in

sedimentary rocks– Trilobite in sandstone– Fern in shale– Bivalves shells in limestone

Page 2: 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

• 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

Grand Canyon

Canyonlands,

Utah

Page 3: FOSSILS IN SEDIMENTARY ROCKS Most fossils are preserved in sedimentary rocks –Trilobite in sandstone –Fern in shale –Bivalves shells in limestone

SEDIMENTARY STRUCTURES

• Ripples formed by air & water currents

• Cross bedding inside the ripples & dunes

Page 4: FOSSILS IN SEDIMENTARY ROCKS Most fossils are preserved in sedimentary rocks –Trilobite in sandstone –Fern in shale –Bivalves shells in limestone

SEDIMENTARY STRUCTURES

• Mudcracks form when sediments dry out & shrink

Page 5: FOSSILS IN SEDIMENTARY ROCKS Most fossils are preserved in sedimentary rocks –Trilobite in sandstone –Fern in shale –Bivalves shells in limestone

SEDIMENTARY STRUCTURES

• Ancient coral reefs in limestones are giant sedimentary structures

Permian reef of west Texas

Page 6: FOSSILS IN SEDIMENTARY ROCKS Most fossils are preserved in sedimentary rocks –Trilobite in sandstone –Fern in shale –Bivalves shells in limestone

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