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sedimentary structures | Indentify Sedimentary Structures!

- Geology 101 with Franseen at University of Kansas - StudyBlue

sedimentary structures | Crossbedding in the Toroweap (Leighty)

sedimentary structures | Crossbedding in the Toroweap (Leighty)

Lacustrine Deposits | ... lacustrine deposits the sedimentary structures indicate that both

Lacustrine Deposits | ... lacustrine deposits the sedimentary structures indicate that both

sedimentary structures | Sedimentary structures and bedding styles.

sedimentary structures | Sedimentary structures and bedding styles.

sedimentary structures | ... sedimentary structures in sandstones indicating layers of sediment

sedimentary structures | ... sedimentary structures in sandstones indicating layers of sediment

sedimentary structures | Sedimentary Structures

Sedimentary Structures - Geology As with Millie at Richard Huish College - StudyBlue

sedimentary structures | climbing ripples in an environment of fast sedimentation climbing ...

Sedimentary structures and stuff

sedimentary structures | Sedimentary structures and bedding styles.

sedimentary structures | Sedimentary structures and bedding styles.

But the big clasts haven’t disappeared. They are now isolated and less common in general, though when they occur, they tend to occur in the same horizon:

A quick virtual field trip to the Neoproterozoic glaciogenic sedimentary rocks from the central Virginia Blue Ridge province: Can you feel the chill of Snowball Earth?

Of course, there isn’t merely a sedimentary / biological story recorded here; structural geology plays an important role in our interpretation, too. These turbidites (rocks deposited by turbidity currents) were involved in Appalachian mountain-building. When ancestral Africa collided with ancestral North America in the orogeny that assembled Pangaea, these strata were squeezed. Pressure solution on a microscopic level imparted a cleavage that’s most pronounced in the shalier layers:

A report from the field: new outcrops of Ordovician-aged turbidites featuring geopetal indicators, fossil content, and a structural overprint imparted during Pangaea's assembly.

sedimentary structures | Sedimentary structures and bedding styles.

sedimentary structures | Sedimentary structures and bedding styles.

sedimentary structures | Sedimentary Structures

Sedimentary Structures - Geology As with Millie at Richard Huish College - StudyBlue

sedimentary structures | Terrace at Scott Creek Beach

sedimentary structures | Terrace at Scott Creek Beach

Teepee Structure in modern halite deposits along the western shore of the Dead Sea

Teepee Structure in modern halite deposits along the western shore of the Dead Sea

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A quick virtual field trip to the Neoproterozoic glaciogenic sedimentary rocks from the central Virginia Blue Ridge province: Can you feel the chill of Snowball Earth?

During the summer warm season (or perhaps during longer-duration interglacial periods) the ice melted, the water flowed, the icebergs calved, and all of this is recorded with a switch from finer sediment to coarser, in particular the presence of outsized clasts (putative dropstones):

A quick virtual field trip to the Neoproterozoic glaciogenic sedimentary rocks from the central Virginia Blue Ridge province: Can you feel the chill of Snowball Earth?

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