Bedding & Sedimentary Structures
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In plain terms
Layers aren’t just stripes—they’re records of moving water, wind, and changing conditions.
Common structures
- Cross-bedding: angled layers from dunes or ripples
- Ripple marks: wave or current ripples
- Graded bedding: coarse to fine upward (settling from a flow)
- Mud cracks: drying at the surface
Key takeaways
- Structures can indicate flow direction and energy.
- Graded beds often signal rapid deposition events.
- Mud cracks indicate exposure and drying.
- Cross-beds can form in rivers, deserts, and shorelines.
- Context ties structures to environment.