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Group: Mid-Atlantic Geo-Image Collection (M.A.G.I.C.)

Billy Goat Trail

Ccd39ee8b6a9545a367f451722f824c3

11 GigaPansViews

For students in GOL 105, GOL 135, and any other class where GigaPans of the Billy Goat Trail might be helpful.

Created by
Robin Rohrback-Schiavone
Avg. Size
1.07353 gigapixels
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148
Dated added
December 20, 2012
Categories
geology, landscape
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  1. In this panorama, the Potomac River can be seen flowing through Mather Gorge in Great Falls Park. It was taken from the Virginia side of Great Falls, looking towards the Maryland side. Cliffs of metagraywacke line Mather Gorge, and have been dated at ~460 Ma. Steeply dipping lamprophyre dikes can be seen intruding into...

  2. In this panorama, the Potomac River can be seen flowing through Mather Gorge in Great Falls Park. It was taken from the Maryland side of Great Falls, looking towards the Virginia side. Cliffs of metagraywacke line Mather Gorge, and have been dated at ~460 Ma. Steeply dipping lamprophyre dikes can be seen intruding into...

  3. The Rocky Islands are exposures of Proterozoic-age metagraywacke of the Mather Gorge Formation. Graywacke is a "dirty" sandstone deposited by turbidity currents in submarine fans (a.k.a. "abyssal fans"), which are essentially big piles of sediment in deep ocean basins. This is likely the original enviro...

  4. There is one rock exposed along the Billy Goat Trail which is a bit more enigmatic. It is amphibolite, a metamorphic rock very rich in the mineral amphibole (a.k.a. hornblende), which shows up as black in this picture. The white portions of the rock are plagioclase feldspar. This is a very mafic metamorphic rock, with ...

  5. The Rocky Islands are exposures of Proterozoic-age metagraywacke of the Mather Gorge Formation. Graywacke is a "dirty" sandstone deposited by turbidity currents in submarine fans (a.k.a. "abyssal fans"), which are essentially big piles of sediment in deep ocean basins. This is likely the original environment where t...

  6. This image shows three generations of Potomac riverbed, called straths. How does a river deepen its channel? One way is through nickpoint propagation. A nickpoint develops when the river's base level drops. (Base level dropping could be caused by sea level dropping, or the land uplifting, or other reasons.) On th...

  7. The Acadian Orogeny took place mainly to the northeast of here. (As the name implies, Acadian-aged rocks are well-exposed in Acadia National Park in coastal Maine.) Along the Billy Goat Trail, they left one set of important structures: a series of four parallel dikes filled with the igneous rock called lamprophyre. ("L...

  8. The Acadian Orogeny took place mainly to the northeast of here. (As the name implies, Acadian-aged rocks are well-exposed in Acadia National Park in coastal Maine.) Along the Billy Goat Trail, they left one set of important structures: a series of four parallel dikes filled with the igneous rock called lamprophyre. ("L...

  9. As North America collided with the Chopawamsic Terrane during the Taconian orogeny, temperatures within the crust started to rise. As things got warmer, partial melting occured. Minerals present in the graywacke that had low melting temperatures, like quartz, potassium feldspar, and muscovite mica (felsic minerals) all...

  10. 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 ...

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