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Gigapans

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  1. This is an exposure of the Catoctin formation at Point of Rocks in Maryland, on the north bank of the Potomac River. Point of Rocks is a prominent water gap cut by the Potomac River. The Catoctin formation is Neoproterozoic in age and was erupted as a series of flood basalts during the breakup of the Mesoproterozoic su...

  2. This is an exposure of the Catoctin formation at Point of Rocks in Maryland, on the north bank of the Potomac River. Point of Rocks is a prominent water gap cut by the Potomac River. The Catoctin formation is Neoproterozoic in age and was erupted as a series of flood basalts during the breakup of the Mesoproterozoic su...

  3. This amazing piece of float was located under the Route 15 Bridge in Point of Rocks, MD. My current thinking is that the lower left corner is Catoctin formation but I am scratching my head over the upper right portion. Perhaps it is also Catoctin Metabasalt just with a different, more rigid consistancy. However, the p...

  4. This outcrop can be found along the Difficult Run Trail north of Georgetown Pike. The North. This is part of the Mather Gorge Formation. A proterozoic metagraywacke. This outcrop is an example of partial melting in action. As the graywacke underwent high grades of metamorphism some of the minerals (particularly quartz ...

  5. This gigapan is of the Balls Bluff Siltstone. It is upper Triassic in age. This road cut exposes the middle to upper part of the formation. This is likely the fluvial and deltaic sandstone and siltstone member described by Scott Southworth, William C. Burton, J. Stephen Schindler, and Albert J. Froelich in their 2006 g...

  6. Leesburg Member of the Balls Bluff Siltstone also known as the Leesburg Conglomerate. This is a Triassic Basin sediment found along to the east of the Blue Ridge Anticlinorium. It is part of the Newark Supergroup. It contains limestone clasts likely originating from the Tomstown Formation and the Frederick Limestone...

  7. This is an image of chevron folds in the Catoctin Formation. The The Catoctin Formation was a flood basalt which formed during the rifting that formed the Iapatus Ocean (The Proto-Atlantic). It formed approximately 560 mya during the Ediacrin Period, part of the Pre-Cambrian. Since its deposition it has undergone hydro...

  8. This outcrop can be found along the Difficult Run Trail north of Georgetown Pike. The camera is pointed South. This is part of the Mather Gorge Formation. A proterozoic metagraywacke. This outcrop is an example of early stages of partial melting in action. As the graywacke underwent high grades of metamorphism some ...