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Gigapans

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  1. The Keyser Limestone is the lowest formation of the late Silurian to early Devonian Helderburg Group. It records stable platform deposits which accumulated in the quiet period between the Taconian and Acadian orogenies. This sample was collected and contributed by Dr. Michael Mengason.

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  2. This outcrop is located on Rt 522 on the western limb of the Mt Pleasant Syncline showing Devonian-age marine clastic sediments of the Foreknobs Formation. This is the lower section of the Foreknobs, which is the Mallow Member according to current stratigraphic division. This image is part of the MAGIC (Mid Atlantic...

  3. Some nice sets of crossbeds (angled sedimentary bedding) in sandstone (Wahweap formation, according to my field notes). The angled beds formed in a sand dune, most likely, that is preserved now in the rocks. The compass is for scale...

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  4. A lovely exposure (though rather harshly lit) of the contact between two Cambro-Ordovician limestones in the Shenandoah Valley. Geologic map of the site is here: ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=14868 Will open in a new tab or window The same contact can be seen in the vicinity of Strasburg, Virginia, here: www.gigapan.com/gi...

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  5. Acadian turbidites, folded during the Alleghanian Orogeny. Look for slickensides, trace fossils, turbidity current structures. For more information on the Brallier, check out this map of the location: ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=8643 Will open in a new tab or window

  6. Cross-sectional view of folded Martinsburg Formation beds . On the left (south), the bedding is oriented 030°, 38° (right hand rule). On the right (north), it's oriented 245°, 30° (right hand rule).

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  7. Outcrop of the late-Ordovician-aged Martinsburg Formation (turbidites/flysch) shed off the Taconian Orogen to the east into the adjacent deep marine basin. The strata were later tilted and cleaved during Alleghanian mountain-building.

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  8. This is a subvertical bedding plane (220° / 80°, right hand rule) of the late Ordovician Martinsburg Formation, showing the bottom of a turbidite bed. Several features are visible in this bottom-up perspective.

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  9. Volcaniclastic breccia from the May 18, 1980 eruption of Mount. St. Helens. Found approximately four miles northwest of Toutle, WA. To explore all of this sample's features, click here: gigapan.com/gigapans/121349 Sample collected and contributed by Lee Gonzalez.

  10. Outcrop of the late-Ordovician-aged Martinsburg Formation (turbidites/flysch) shed off the Taconian Orogen to the east into the adjacent deep marine basin. The strata were later tilted and cleaved during Alleghanian mountain-building.

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