Geological Society of London. 379 



its progress until it reached the edge of the 100-fathom plateau, 40 

 or 50 miles beyond the Outer Hebrides, and then gave off its ice- 

 bergs in the deep waters of the Atlantic. 



Discussion.— Prof. Owen corroborated the author's views as to the grand 

 marks of glaciation on the island of Lewis which had come under his personal 

 observation. 



5. " Notes on the Glacial Phenomejaa of the Hebrides." By J. F. 

 Campbell, Esq., F.G.S. 



This communication consisted of notes extracted from the author's 

 journal, giving his observations of indications of glacial action in 

 various islands of the group of the Hebrides. Heynish in Tiree is 

 500 feet high, and has many large perched blocks on its top. These 

 blocks are of gneiss, and the author thought they came from the 

 north-west. The Barra islands are described as rocky, and resem- 

 bling the hill-tops of a submerged land. All ice-marks found by the 

 author seemed to him to come from the north and west. He thought 

 that the final grinding was given by floating ice when the land was 

 more submerged than at present. At Castle Bay, in Barra, the 

 author observed well-preserved glacial strige at the sea-level in a 

 direction from N.N.W. The whole island is glaciated and strewu 

 with perched blocks. Glacial indications were also observed in 

 South Uist, Benbecula, and Skye ; and the author stated that, on the 

 whole, he was inclined to think that the last glacial period was 

 marine, and that heavy ice came in from the ocean, the local condi- 

 tions being like those of Labrador. The author regarded most of 

 the lake-basins of the Hebrides as formed by ice-action, and con- 

 sidered that the ice by which those islands were glaciated came from 

 Greenland. 



6. " On Fossil Corals from the Eocene Formation of the West 

 Indies." By Prof. P. Martin Duncan, M.B., F.E.S., Y.P.G.S. 



The author had considered his labours amongst the fossil corals of 

 the West Indian Islands finished, but lately a very fine collection has 

 been sent to him from the University of Upsala, and Mr. P. T. Cleve 

 of Stockholm. The specimens were collected from limestone and 

 coral conglomerates, which are covered by and rest upon volcanic 

 debris and ejectamenta in the island of St. Bartholomew. The 

 species represented there are numerous, and may be divided into : — 

 Group 1, Species not hitherto known ; 2, Species with a Cretaceous 

 facies ; 3, Species characteristic of the horizons of the Upper 

 Eocene and Oligocene deposits of Europe ; 4, Species found also 

 in the Nummulitic deposits of Europe and Scinde ; 5, Species belong- 

 ing to the recent coral fauna ; 6, Species referable to genera which 

 belong to the Jurassic and to the Caribbean fauna. 



The determination of the forms of the associated Mollusca and 

 Echinodermata permit the following deposits being placed on a 

 general geological horizon, — the limestone and conglomerate of St. 

 Bartholomew, the dark shales beneath the Miocene of Jamaica, the 

 beds of San Fernando, Trinidad. These were probably contem- 

 poraneous with the Java deposits, the Eocene of tire Hala chain, the 

 great reefs of the Castel Gomberto district, the reefs of Oberberg in 

 Steiermark, and the Oligocene of Western Europe. 



