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3 April 2010
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.
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 …
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 …
7 March 2010
Rusty weathering rind
On a granite block
Giant ground sloths
In the American Museum of Natural History: These mylodontids reminded me of Puerto Natales…
Where I am today
Graphics by USGS, after Schuberth, 1967.
6 March 2010
Travertine nubbins on a bridge
Another in the Geology Of Central Park series…
Propagation direction: upper left towards lower right:
Glacial striations, southern Central Park
New York City has some cool geology: Paleozoic metamorphics scraped by Pleistocene glaciers.