PRIMARY SEDIMENTARY STRUCTURES A)Stratification Structures & Bedforms 1) Bedding & Lamination 2) Bedforms 3) Cross-lamination 4) Irregular stratification.

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Presentation transcript:

PRIMARY SEDIMENTARY STRUCTURES A)Stratification Structures & Bedforms 1) Bedding & Lamination 2) Bedforms 3) Cross-lamination 4) Irregular stratification B) Bedding Plane Markings

BEDDING

Laminations < 1cm

Graded Bedding – Which way is up?

Bedforms & Cross-Stratification A) Ripple Marks – modern beach

Ripple Marks in Sandstone – Rock was formed on an ancient beach

2) Sedimentary Structures B) Cross Beds – the inside of Ripple Marks

Checkerboard Mesa – Zion National Park, Utah

Barchan Consistent wind Limited Sand Transverse Consistent wind Abundant Sand Parabolic “Blowouts” Coastal Dunes

Linear (Seif) Converging wind. Limited Sand Star Dunes Variable wind directions.

2) Sedimentary Structures C) Mud Cracks – Environment that periodically dries out

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