"Weare" isn't in my unabridged dictionary, but I think it is related to "weir."

Weir is one of these words with a long and complex family tree. It comes from the Anglo-Saxon wer-, to protect, and is related to the German wehren. So weir is related to the word Wehrmacht, which was (is?) the German army. Ultimately, the word is traced back to the Sanskrit vrnoti, "he keeps in." And of course, this is what a weir does - keeps water in the pond.

Since the gigantic talus piles of the Weares both protect the cliff from erosion and hinder movement along the base, I believe they are bona fide members of the "weir" family of words.
----------
Thanks for the link to the geological site.