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11 October 2016

A virtual field trip to Portrush, Northern Ireland

One of my favorite places in Northern Ireland is the east side of the peninsula that hosts the tourist town of Portrush. There, two early schools of geological thought engaged in a battle. The opposing sides were: the Neptunists, who thought all stratified rocks, and in particular basalt, must form from precipitation from the sea, and the Plutonists, who thought some rocks, including basalt, formed through intrusion of molten rock …


27 March 2016

Another trio of 3D models

Here are three more of my Photoscan-generated, Sketchfab-hosted 3D models of rock samples: Mud cracks in Tonoloway Formation tidal flat carbonates, Corridor H, West Virginia: [sketchfab id=”49cfc017248e44c2aa8b8bcdfa18facd” start=”0″ spin=”” controls=”0″] Diorite from the eastern Sierra Nevada of California: [sketchfab id=”36184956acb94476ae84569b8fbc300b” start=”0″ spin=”” controls=”0″] Vein cross-cutting foliated & lineated gneiss, Blue Ridge basement complex, Virginia: [sketchfab id=”1ebf2edc042d4cdf9493d0ff7963aff5″ start=”0″ spin=”” controls=”0″]


19 December 2014

Friday Fold: Mist Mountain Formation in Canmore, Alberta

Let’s journey to the Cretaceous today, to see sandstones, shales, and even some coal strata that have been folded during the eastward thrusting that built the Canadian Rockies. Here’s the same fold, in context, shot in GigaPan on a different day, from a different angle. Can you match it up? [gigapan id=”159471″] link Ben Gadd showed me (and my field class) this site last summer. It’s a little west of …


12 March 2013

Five new GigaPans from Thoroughfare Gap

Yesterday, I took five new GigaPans at Thoroughfare Gap, a water gap where Broad Run cuts through Bull Run Mountain, the eastern limb of the Blue Ridge Anticlinorium at my latitude. The rocks here are the Cambrian-aged Chilhowee Group, with bedding tilted moderately to the east during Alleghanian mountain-building in the late Paleozoic. To the west is the crystalline core of this massive regional fold, and to the east is …