2001 Black Sand Beach, California
Yosemite National Park
Wallace Creek, Carrizo Plane, California
Pfeiffer Beach, California
Pinnacles National Monument
Holtwood Gorge, Pennsylvania
Lenticular beds, Bedford Couny, Pennsylvania
Horseshoe Curve, Pennsylvania
31st Virginia Field Conference


These photos are from Black Sand Beach, in the Marin Headlands, Marin County, California, taken March 3, 2001. The top one shows why the place is named as it is, with a pencil for scale so you can see how coarse the sand is (compare this with the sand at Pfeiffer Beach, below). The bottom one shows a recent landslide, which is a very common occurrence in this part of California. You can see the path of the debris on the hill.
This is a photo of a roadcut through a moraine along Rt. 140 in Yosemite National Park, California, with Danielle Foye on the boulder for scale. Click here for a picture of a granitic rock from the moraine. Photo taken March 5, 2001, facing north.
This is a photo of Wallace Creek, on the Carrizo Plane of central California. There are two bends in the creek shown in the photograph. Danielle Foye is standing on the left side of the bend in the background (pretty small). The reason for the bend is that the creek is cut by the San Andreas Fault, which is a right-lateral strike slip fault which separates the North American Plate from the Pacific Plate. Photo taken March 6, 2001, facing northwest.
GPS 35.271656,-119.827646








These are five photos from Pfeiffer Beach, along the Big Sur coast of California south of Monterey. The diversity of geology there is amazing. The photos were taken between 3:00pm and 5:00pm Pacific Time on March 8, 2001, at low tide. The first photo shows an overview facing southeast. The second photo shows water rushing through a "keyhole" and spreading out over some rocks in the intertidal zone, which is full of interesting organisms. The third photo shows folds in the rocks landward of the beach. Note also the large cobbles in the foreground. The fourth photo shows the sand on the beach, with a pencil for scale (compare this with the sand at Black Sand Beach, above). The fifth photo shows an outcrop of some sediment (center, above large boulder in foreground) that is clearly of intermediate age, that is younger than the rocks in the area but older than the beach sediments and landslides.


These are photos of Pinnacles National Monument, San Benito County, California, taken March 10, 2001. The pinnacles are the erosional remnants of Miocene volcano, which is 23 million years old. Interestingly, the volcano was cut in half by the San Andreas Fault, so another part of it is 195 miles to the south on the other side of the fault. The top photo shows a view of the pinnacles from the western visitor center parking lot, and the bottom one shows a close up of one of the pinnacles.


These photos are from Holtwood Gorge along the Susquehanna River, south of the rt. 372 bridge in Lancaster County, Pennsylvania. The rock is the early Paleozoic Wissahickon Schist. The top photo shows small islands of rock in the river, and the steep sides of the gorge in the background. The bottom photo shows Danielle Foye standing above one of the potholes that are very common on the islands. Photos taken April 7, 2001.
GPS 39.814832,-76.319324


These photos show lenticular bedding in the Ordovician Reedsville Shale at an outcrop along rt. 36 near Loysburg, Bedford County, Pennsylvania. The lenses are made of calcareous sandstone. The lower photo is a close up of one of the lenses, and shows the crossbedding and also evidence of borings into the sand along the top of the lens. Photos taken August 5, 2001.
This photo shows an outcrop of the Upper Devonian Irish Valley Member of the Catskill Formation along the Horseshoe Curve in Blair County, Pennsylvania. This is "Stop 5" of the field trip guide by John Inners. Photo taken September 22, 2001.




These photos were taken during the 31st Virginia Field Geological Conference, entitled Post-impact effects of the Eocene Chesapeake Bay Impact, lower York-James Peninsula, Virginia, and held on October 20, 2001. They all show the Pliocene Yorktown Formation, at Stop 1 of the field trip. The first photo shows Carters Grove Bluffs along the James River. The second shows the Sunken Meadow Member of the Yorktown Formation. The third shows the Rushmere Member, which contains abundant Chama sp. bivalves.



Copyright 2006 James L. Stuby. All Rights Reserved.