Index to

The Igneous and Altered Rocks of South-west Devon

by

R.N. Worth, F.G.S. etc.

Trans. Devon Assoc. 1887, Vol. XIX, pp. 467-497

Prepared by Michael Steer

The paper was presented at the Association’s July 1887 Plympton meeting and provides the genealogist with a treasury of names associated with the earliest research into our county’s unique Geology. The territory on which the author focuses comprises roughly the area between the Tamar west and the Erme east, and from the parallel of Lydford north to the sea south. The stratified rocks identified by Mr. Worth are mainly Devonian, but Carboniferous and have been assigned to the more northern limits. There is a trace of Triassic on the southern border, probably Silurian rock is represented, and Archaean rock is found in the Channel. The Archaean period is a division of Precambrian time (about 4.6 billion to 541 million years ago) and the period when life first formed on Earth. The author claims that no part of Devon of equal size is so rich in the variety of its petrology. The article, from a copy of a rare and much sought-after journal can be downloaded from the Internet Archive. Google has sponsored the digitisation of books from several libraries. These books, on which copyright has expired, are available for free educational and research use, both as individual books and as full collections to aid researchers.