Bellingham Conglomerate

The Bellingham Conglomerate is one of several Pennsylvanian stratigraphic units in eastern Massachusetts. It is mainly a conglomerate and greywacke, exclusive to the Bellingham Basin. The conglomerate has granite and quartzite pebbles in a mica matrix.
These are sourced from the neighboring Blackstone Group and Milford Granite. The two main rock types are interbedded with chlorite phyllite, which contains minerals such as muscovite, quartz, zoisite, magnetite and chloritoid.
The formation may be the same age as the Roxbury Conglomerate in the Boston Basin.

Outcrops

The conglomerate outcrops are found at several different locations. Two notable examples include the intersection of Blackstone Street and River Street in Woonsocket, with green sandstone and conglomerate or cliffs on the side of Woonsocket Hill.