These ideas are based upon cursory image interpretation only. I have never been there.
In the black and white elevation and slope renderings, the area west of Danbury has numerous dark channels draining to the south are partially overprinted by drainages of the Housatonic River draining in a south eastern direction. Within the southbound drainages are lumps and bumps of bedrock which appear similar to scoured basalt bedrock if the glacial floodways of the Dry Falls area in the scablands of Washington. Prominent large bare hills scraped of soils are called Monadnocks. The bumps in the floodways are more like mad rocks.