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3 April 2010

Diatom time

Today’s EPOD is of a diatom. Seems like as good an excuse as any to share a couple photos of a big brass diatom sculpture from the American Museum of Natural History in New York. Finger for scale, but not really, since the sculpture isn’t to scale.

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11 March 2010

Folds of New York

Thursday is ‘fold day’ here at Mountain Beltway. Let’s take a look at some folds I saw last weekend in New York City. We’ll start with a bunch seen in the Manhattan Schist in Central Park. Here’s an example of the foliation in the schist. It’s got finer-grained regions and coarser, schistier regions with big honking muscovite flakes. Metamorphic petrologists: Does this correspond to paleo-bedding? (i.e. quartz-rich regions that metamorphose …

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10 March 2010

Pyrolusite on a pterosaur

All the photos I posted over the weekend here were via iPhone, and hence not particularly high-quality, despite their excellent geological content. Now I’ve downloaded the photos from my real camera, and have a few good ones to show. Here’s a succession of photos of the same specimen of Pterodactylus longirostrus, each progressively more zoomed in than the last. It’s a late Jurassic pterosaur (140 Ma) from the Solnhofen limestone …

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7 March 2010

Rusty weathering rind

On a granite block

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Giant ground sloths

In the American Museum of Natural History: These mylodontids reminded me of Puerto Natales…

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Where I am today

Graphics by USGS, after Schuberth, 1967.

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6 March 2010

Travertine nubbins on a bridge

Another in the Geology Of Central Park series…

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Plumose structure

Propagation direction: upper left towards lower right:

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Erratic

!!!

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Glacial striations, southern Central Park

New York City has some cool geology: Paleozoic metamorphics scraped by Pleistocene glaciers.

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