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Gigapans

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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. 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...

  5. 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...

  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