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Directional Structures

Directional Structures. Show current direction Examples include such things as cross-beds, ripples, imbrications, flute casts Show current trend Examples include groove casts, parting lineation. Cross-bedding. Current Direction. Current from left to right. Ripple Marks.

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Directional Structures

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  1. Directional Structures • Show current direction • Examples include such things as cross-beds, ripples, imbrications, flute casts • Show current trend • Examples include groove casts, parting lineation

  2. Cross-bedding • Current Direction • Current from left to right

  3. Ripple Marks • Asymmetric Ripples show current direction

  4. Flute Casts • Found on the bottom of beds • scoop like structure

  5. Parting Lineation • Yields current trend, not direction

  6. Groove Cast • Yields trend of direction

  7. Topping Indicators • Structures used to determine tops in sedimentary rocks include the following • Sole marks, Graded beds, Cross-beds, Symmetrical ripples, Mudcracks

  8. Ripple Marks • Symmetric Ripples show tops

  9. Graded Bed • Usually found in greywacke, caused by deposition of coherent mixtures of gravel, sand, mud and water

  10. Mudcrack • Mudcracks occur in areas that are flooded and then dry out.

  11. Sole Marks • Sole marks occur on the bottom of beds. Include flute and groove casts

  12. Cross-bedding • Is truncated on the upper side of the bed

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