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Serpentinite from the Josephine ophiolite sequence collected north of Gasquet, CA.
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- 119
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- 28
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Metamorphosed mudstone, stratigraphically above (east) of the Weverton Formation here in the easternmost Blue Ridge province. Exposure is on the railroad tracks just north of Chapman's Mill, at Thoroughfare Gap, Virginia.
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- 209
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- 26
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Scale at top is in centimeters.
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- 221
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- 18
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This outcrop of the late Ordovician Martinsburg Formation is located on Route 644 in Shenandoah County, about 20 feet above the North Fork of the Shenandoah River. GigaPan Stitch seems to have had some issues putting it together, which is frustrating. Still, there's a lot to be seen. At this outcrop, bedding is o...
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- 304
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- Martinsburg Formation, Millner Road (near Deer Rapids Road), Shenandoah County, Virginia by Callan Bentley
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This outcrop of the late Ordovician Martinsburg Formation is located on Route 644 in Shenandoah County, about 60 feet above the North Fork of the Shenandoah River. At this outcrop, bedding is oriented 042°, 72° (right hand rule: it strikes N42°E, and dips 72° to the southeast). Cleavage is oriented 212°, 83° (...
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- 191
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- 29
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Amphibolite similar to the amphibolite exposed on the Billy Goat Trail. Amphibolite is a metamorphic rock very rich in the mineral hornblende (an amphibole), which shows up black in this image. The white mineral in the rock is plagioclase feldspar. This is a very mafic metamorphic rock, with large crystals. Amphi...
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- 238
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- 1
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The Wilhite Slate is pictured with a series of folds.
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- 88
- Explore Score
- 28
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Muscovite schist (metamorphosed Harpers Formation?) from Throroughfare Gap / Bull Run Mountain, Virginia, bearing euhedral porphyroblasts of magnetite. Sample measures 8.5 by 2.5 cm. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro...
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- 331
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- 1
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Teeming with garnets big and small, fresh and weathered, the Setters Schist is a muscovite schist metamorphosed from a pelitic protolith in (presumably) the Taconian orogeny. It also features staurolite, which is present in this sample, and kyanite, which isn't. Sample collected in Sparks, MD. Image made as part ...
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- 473
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- 46
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Looking north along the Big Sur coast at the mouth of Bixby Creek. The rocks on the sea cliff across the cove are part of the Sur Series, a package of igneous and metamorphic rocks that represents the basement on which a volcanic arc was built after the west coast of North America changed from a passive to active conti...
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- 151
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- 1

