Assertion: ridge's valley | /r/CapableOf | deepen along the boundary
Facets:
value: between st. clair and calhoun counties
type: LOCATION
Source sentences:
text: To the southwest, the valley narrows and deepens along the boundary between St. Clair and Calhoun counties, where the river cuts through the more resistant shale and sandstone of the northern edge of the Coosa Ridges district.