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Gigapans

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  1. Non-welded rhyolitic pyroclastics from the F2 ashfall layer of the Bishop Tuff. Age: 760 Ka. The petri dish is 9 cm in diameter. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here: gigamacro.com/gigapixel-m Will open in a new tab or window...

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  2. The Brallier Formation shale is a Devonian-aged turbidite sequence shed off the Acadian orogeny. This sample was collected from an outcrop on new New Route 55, just west of Moorefield, WV. The Brallier Formation can be seen in this image by Alan Pitts: gigapan.org/gigapans/97256 Image made as part of the M...

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  3. Brachiopod body fossils in the Ridgeley Member of the Old Port Formation, a Devonian sandstone (quartz arenite) which outcrops in Maryland, Pennsylvania, and West Virginia. This outcrop is in a railroad cut on the Great Allegheny Passage, approximately one mile northeast of the intersection of Cash Valley Road with ...

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  4. Featuring actinolite, augite, almandine, epidote, quartz, orthoclase, and magnetite. The petri dish is 9 cm in diameter. Sample provided by Siim Sepp of sandatlas.org. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as see...

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  5. Sphalerite cyrstals on fossiliferous chert from Cherokee County, OK. This sample was graciously donated by David and Leslie Nanney.

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  6. 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...

  7. Sediment collected from Wadi Al Khames in the Al Hajar Mountains in Oman. Geolocation is approximate; Google Maps can't find Wadi Al Khames, apparently.

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  8. 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...

  9. Collected in the Sierra Nevada, California. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here: gigamacro.com/gigapixel-macro-imaging-system Will open in a new tab or window/

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  10. 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...

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