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#pluton

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Chris White

Where is Babel Rock?

The #USGS #BlueHills #quad #bedrock map and a #Quincy #Massachusetts #historical #map show Babel Rock overlooks a pond from just north of a bend in #Wampatuck Rd. I have been on that rock, and it's #diabase, a #mafic #intrusion into the Quincy #pluton. But the USGS #topographic quad & derivatives e.g. #GoogleEarth show it adjacent to the #BunkerHill #quarry (source of the #granite for the monument in #Boston).

Should a correction be proposed to USGS? Advice welcomed.

A USGS bedrock map of the vicinity of Babel Rock. The diabase intrusion of the Quincy Granite is marked with a blue arrow, and labeled as such on this map. The red arrow shows the approximate location of Bunker Hill quarry, and the location shown for Babel Rock on most current maps.
A crop of a map of Qunicy, Massachusetts from 1907. The blue arrow shows Babel Rock near the pond and inside the bend on Wampatuck Road. The Red Arrow indicates Bunker Hill Quarry, and is near the feature labeled Babel Rock on most current maps.
A crop of the Blue Hills quad USGS topo map, focused on the area of Babel Rock. The blue arrow indicates the feature labeled as Babel Rock on the historic and bedrock maps, but it is unlabeled here. The red arrow shows the feature near Bunker Hill Quarry that this map labels as Babel Rock.
This Google Earth view shows the area of Babel Rock. The blue arrow indicates a diabase exposure, which is labeled as Babel Rock on the USGS Blue Hills bedrock map and on the historic map. The red arrow shows the feature currently labeled as Babel Rock here and on the USGS topo map, near Bunker Hill quarry. Quarried exposures of Quincy Granite are visible above (north) of the feature labeled "Babel Rock" on this view.
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