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You are browsing the archive for 2010 March 17.

17 March 2010

Live geoblogging: assessment

What do you think, folks? Do you like seeing field photos as I take them? Should I continue the Transect Trip instant photoblog series tomorrow as we traverse the Valley & Ridge?

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Transect Trip 13: a better plume!

Okay… That last plumose structure was nothing compared to this beauty…

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Transect Trip 12: plume du jour

Spectacular plumose structure on rusty joint surface Weverton Formation:

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Transect Trip 11: bedding/cleavage

Bedding and cleavage intersect in the Weverton Fm. Bedding = Cambrian Cleavage = late Paleozoic (Alleghanian)

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Transect Trip 10: en echelon tension gashes

Gorgeous back-rotated quartz-filled tension gashes in the Antietam Fm. Sinistral sense of shear:

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Transect Trip 9: Skolithos B

Side view of Skolithos tubes:

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Transect Trip 8: Skolithos A

Looking down on Skolithos ichnofossils in the Antietam Fm. quartz sandstone:

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Transect Trip 7: mudchips

A few rip-up clasts in arkosic matrix (Swift Run Fm.):

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Transect Trip 6: coarser Swift Run

Live geoblogging continues… Here’s some nice round quartz pebbles in the Swift Run Fm:

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Transect Trip 5: bedding in the Swift Run

Neoproterozoic arkose and mudstone above the basement complex:

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