EXPLANATION OF THE PLATES.
Map of Northumberland and Durham, to illustrate Mr. Winch's paper.
The colouring points out the different rocks. The contact of that series called
the Leadmine measures or Mountain limestone with the red marl or sandstone to the westward of Temming towards Brampton is not accurately ascertained, but a little to the south-east it has been traced by Professor Buckland from Melmerby to Murton, and is laid down in the map accompanying his paper (Plate 5.) The letters U and D, placed against the common slip dykes of the coal measures denote that the strata are elevated or depressed on that side by the number of fathoms marked atler the letter.
Is a figure of the fossil Fish, apparently belonging to the genus Chœtodon, found in the magnesian limestone at Low Pallion, as mentioned in page 9.
Is a plan, communicated to the Society by Mr. Hill of Newcastle, of the Dyke in Walker Colliery, taken at the level of the High Main Coal, 100 Fathoms from the surface. The sectional lines, AA and BB, mark the situation of horizontal drifts that have been cut through the dyke, the particulars of which are given in page 22.
Fig. 1. Shows the manner in which the magnesian limestone overlies the Coal measures at Whitley quarry near Cullercoats. The ninety-fathom Dyke is seen passing through the Coal measures, and the limestone appears deposited in a hollow or trough upon them in a manner that shews at to be of a subsequent age, as the former are much dislocated by the dyke, while the latter is not at all disturbed. Sec page 4.
Fig. 2. Is a sectional view of the Dyke at Walbottle Dean, described page 23.
