IV.—Notes on Certain Granitoid Fragments from the Culm Conglomerates, and Tourmalinized Grits from the New Red Conglomerates of South Devon

Abstract

When studying the Dartmoor Rocks some years ago I was anxious to ascertain whether any fragments referable to Dartmoor could be detected in the Culm conglomerates and Culm sandstones of South Devon. Sections cut from these rocks, collected for me by my friend Mr. W. A. E. Ussher, F.G.S., proved in every way so dissimilar from Dartmoor rocks and minerals that further investigation in that direction appeared useless. About the same time I collected a variety of fragments from the New Red breccia at Labrador, near Teignmouth, while Mr. Ussher supplied me from other localities. These, again, even when schorlaceous, differed so much from any rocks known to me that I postponed further inquiry in that direction also sine die.