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Gigapans

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  1. 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...

  2. 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 ...

  3. 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 ...

  4. Looking downstream on the Potomac River from the southern end of Billy Goat Trail, loop A, in Chesapeake and Ohio Canal National Historical Park, Maryland. The other side of the river is Virginia. On the hill is Madeira School, and the confluence with Difficult Run is directly across the river in the narrow valley. Roc...

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  5. An exposure of the Mather Gorge Formation, downstream of the "emergency exit" trail off Billy Goat Trail loop A, and upstream of the first sandy beach. Immediately upstream of this outcrop is a prominent belt of amphibolite, and there are large angular amphibolite boudin blocks embedded in this strange rock. ...

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  6. A geologist explains some of the rock formations at Northwest Branch Creek here: nvcc.edu/home/cbentley/geoblog/2008/08/geological-excursion-in-silver-spring.html Will open in a new tab or window

  7. To learn more about this, the largest sub-watershed of the Anacostia River, see: www.neighborsnwb.org Will open in a new tab or window/

  8. For more about the "Northwest Branch Stream Valley Park Unit 3," see: www.mc-mncppc.org/Parks/park_of_the_day/nov/parkday_nov10.shtm Will open in a new tab or window