Assertion: boulder | /r/CapableOf | comprise the foothills erratics train
Facets:
Source sentences:
text: The boulders and smaller gravel, which comprises the Foothills Erratics Train, consist of Lower Cambrian shallow marine quartzite and conglomeratic quartzite, which occurs only within the Gog Group and is found in the Athabasca River Valley of central western Alberta.