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Tyrell, G.W. 1928. The geology of Arran. Edinburgh, HMSO [for the Geological Survey]
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Geology of Arran

By G.W. Tyrell

Tyrell, G.W. 1928. The geology of Arran. Edinburgh, HMSO [for the Geological Survey]

Cover [supplied]

Title page

This web version of the memoir has the following additions, all with Grid references.

  1. Links to thin sections cited in the Memoir
  2. Representative photographs of rock hand specimens of Arran
  3. Survey photographs taken at the time of the original mapping
  4. Links to BGS 1:10,560 County Series geological maps

Contents

Contents

Title page and preliminaries

Chapter 1. Introduction and physical features

Chapter 2 Summary of geology. History of investigation

Chapter 3 The Dalradian Formation

Chapter 4 (?)Arenig rocks

Chapter 5 The Old Red Sandstone

Chapter 6 The Carboniferous rocks

Chapter 7 The Carboniferous rocks (continued)

Chapter 8 The New Red Sandstone. Lower Division (Permian)

Chapter 9 The New Red Sandstone. Upper Division (Triassic)

Chapter 10 Mesozoic Fragments in the Central Ring Complex

Chapter 11 The Cainozoic igneous rocks. Introduction and General Summary. The Crinanite Sills .

Chapter 12 The Cainozoic igneous rocks (continued). Quartz-dolerite and related craignuritic and felsitic intrusions

Chapter 13 The Cainozoic igneous rocks (continued). The Northern Granite

Chapter 14 The Cainozoic igneous rocks (continued). The Central Ring Complex

Chapter 15 The Cainozoic igneous rocks (continued). The Minor acid intrusions

Chapter 16 The Cainozoic igneous rocks (continued). The Arran Dyke Swarm

Chapter 17 Post-igneous, glacial, and post-glacial geology of Arran

Chapter 18 Economic geology

Bibliography

Figures, plates and tables

2024 additions

Photographs of rock hand specimens, Arran. From the BGS Systematic Series

Survey photographs taken as part of the mapping of Arran

BGS 1:10,560 County Series geological maps

South of Corrie, Arran. An erratic, a granite boulder ice-transported eastwards from the main Northern Granite mass during the last glaciation. Erratics are a characteristic feature of glaciated regions and are common on Arran. While the source of this erratic was from the west the general trend of movement of erratics on Arran is southwards; they were prevented from moving any appreciable distance east or west by the pressure of ice sheets which filled Kilbrennan Sound and the Firth of Clyde. Notable occurrences of Northern Granite erratics on Arran are the north shore of Whiting Bay, Glenashdale region, the hillside south of Largymeanoch 1000 yards east of Cnoc na Comhairle and on the scarp of the Dippin crinanite near Dippin.