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 Grand Canyon Canyonlands, Utah

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...