It contains very little organic matter, and abundant sea urchin fossils . and has ripple marks indicative of shallow-water deposition.
22.
These ripple marks are among the most extreme on Earth and have been compared to Martian ripple marks by geologists.
23.
This bed is almost 1 meter thick and is characterized by chocolate-brown ripple marks enclosed in alternating clays and sands.
24.
Ripple marks can be found in much of the rock; they would have formed mostly in shallow water with gentle waves.
25.
Ripple marks are prominent along the lower Cathedral Rock trail, and a black basalt dike may be seen in the first saddle.
26.
The " U . britannica " fish-fin tracks, or trackways are often associated with current or wave ripple marks, probably shallow water, near-shoreline.
27.
They include ripple marks; mudcracked surfaces; cone-in-cone structures; interformational breccias / conglomerates; both normal and reversed small-scale, graded bedding; and local channel fills.
28.
Fossilized mudcracks and ripple marks are found in the Curtis along with up to 28 foot ( 8.5 m ) thick gypsum-rich beds.
29.
Though most sedimentary structures are not visible due to the gypsum interruption, there are a few examples of ripple marks and occasional crossbedding.
30.
Sedimentary structures found in this member include, salt crystal casts in the mudstone, and asymmetrical ripple marks and small-scale cross beds, in the sandstones.
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