Where on (Google) Earth #198?

I greatly enjoyed finding Péter’s lherzolite locality in the French Pyrenees, though it took me a week searching Switzerland before I read his clue carefully and considered the possibility that such gorgeous alpine geology was not hidden in some nook in the Gruyère.

I especially enjoyed the geological aspect of Péter’s challenge – so much so that it has inspired (indirectly) the locality I’ve chosen here. As always, the object of Where on (Google) Earth is to identify the locality of the image below (latitude and longitude will generally suffice), but also to explain the geological significance of the site. Quite often that is simply a matter of interpreting the landforms that can be readily identified in the GE image. However, the landforms seen here are merely the key that will help you unlock the deeper geological significance of the site. I would ask that you refrain from identifying the locality until such time as you are prepared to map out a sufficiently detailed geological explanation. This may be frustrating if you find the locality quickly (a distinct possibility, in this case), but I hope that you’ll find the challenge of unearthing the geological significance of the region a worthwhile quest in its own right.

I think WoGE #198 will be relatively easy to locate, so I’m choosing to invoke the Schott Rule – wait an hour for each WoGE win before answering, please. Post time: 3/13/2010, 23:37 Central Standard Time (USA) – 3/14/2010, 4:37 GMT.

Where on (Google) Earth #198.

Dig in!

Day #101 Outcrop: Differentially Weathered Basaltic Dike

Today’s outcrop is a little north of yesterday’s baked angular unconformity in the Paradise Valley between Gardiner and Livingston, Montana. It is an outcrop of a vertical basaltic(?) dike intruded into volcaniclastic conglomeratic sediments. The dike stands up in positive relief because of differential weathering. There are also a number of small plugs of the same rock just to the northeast of the dike that presumably share its origin. Upon closer inspection, the knobs just to the northeast of the dike appear to be more consolidated deposits of the volcaniclastic conglomerates into which the dike is intruded. None of the field guides of the area I have indicate the age of this dike, but I would presume it is geologically young given the apparently unconsolidated nature of the volcaniclastics that surround it. Note also the center pivot irrigation system in the field in the foreground to get a sense of the scale of this dike. Measuring in Google Earth I estimate it to be about 11 meters wide.

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Approaching from the South

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On Strike View

Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!