Fig. 1. — Map of the Island of Eigg.
P. Pitchstone-porphyry coulee of the Scur. R. Outcrop of ancient river-gravel under pitchstone of Scur. P. Small veins of pitchstone. b. Dykes, veins, and intrusive sheets of basalt-rocks. The short black lines traversing the map in a N.W.-S.E. direction are basalt dykes. f. Intrusive quartziferous porphyry. D. Bedded basalt rocks with occasional tuffs. F. Bedded porphyrite.
4. Clay with Ammonites, Belemnites, &c.
3. Shales and Limestone bands with Cyprids, Cyclas, Ostrea, &c.
2. Thick white and yellow Sandstones with plants.
1. Shales and Limestone bands with Cyprids, Cyclas, Mytilus, and teeth and bones of Reptiles.
X X. Loch Beinn Tighe.
X. Loch a Bhealaich.
—>- General dip of the rocks.
