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Thick sequence of Jurassic-aged conglomerates exposed in Durham, CT. The sediment in these rocks were deposited as alluvial fans off the Eastern Border Fault and later lithified. The sediment doesn't travel very far from the original rock source, so the pieces are large and poorly rounded. As with our earlier pa...
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Lake sediments exposed along Route 9 in central Connecticut. The same outcrop seen in www.gigapan.org/viewGigapan.php?id=18668 , but looking more close up at the structures in the sedimentary layers and the thin film of quartz deposited on the fracture face seen at left center.
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Outcrop of Jurassic-age conglomerate poking out along the eastern edge of the Guida Farm Conservation Area (Middletown, CT). These big pieces of sediment were deposited in an alluvial fan that formed along the edge of the Eastern Border fault, which forms one side of the Connecticut River valley. (And if you're c...
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Another in the series - Jurassic-aged lake bed sediments along Route 9 in central Connecticut. Less well-preserved than the previous sequence (www.gigapan.org/viewGigapan.php?id=18667), but exhibits some interesting sedimentary structures (bending/folding of layers) and deposition of thin layers of quartz alo...
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One of series of Jurassic aged lake bed sediments outcropping along Route 9 in central Connecticut. The thin layers in the middle of this outcrop represent the lake bottom (that's a nice organic-rich shale in the middle), while the more massive red sandstones on either side were deposited on land. More from this...
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First in a series of pans of exposures of the Talcott basalt (early Jurassic age, ~200 million years old) in Meriden, CT Pillow basalts form when lava is erupted underneath water (typically oceans, but in this case a briny lake). The water quickly cools the outside of the lava, but the inside is still pushing outwa...
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Second in a series of pans of exposures of the Talcott basalt (early Jurassic age, ~200 million years old) in Meriden, CT This is a close-up of some of the pillows showing some nice structure - in particular, deposits of a whitish material in between the pillows. This appears to be hyaloclastite, a breccia (or rock...
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Third in a series of pans of exposures of the Talcott basalt (early Jurassic age, ~200 million years old) in Meriden, CT This is a close-up of some of the pillows showing some nice structures. We can get a good idea of the density of the interior of the pillows - either the lava has few dissolved gases, or the pres...
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Fourth in a series of pans of exposures of the Talcott basalt (early Jurassic age, ~200 million years old) in Meriden, CT The left side of the outcrop here is mostly pillows, while the right side is more massive basalt that was erupted on land rather than underwater. The contact between the two runs diagonally from...
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Fifth in a series of pans of exposures of the Talcott basalt (early Jurassic age, ~200 million years old) in Meriden, CT The lower outcrop (Talcott basalt) isn't really pillowy here - the pillows outcrop more to the left of this pan. The distant upper outcrop (Holyoke basalt) is a slightly younger unit that exhibit...
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