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Geology
Exmoor is an upland of sedimentary rocks classified as gritstones, sandstones, slate, shale and limestone, siltstones, and mudstones depending on the particle size. They are largely from the Devonian and early Carboniferous periods (the name Devonian comes from Devon, as rocks of that age were first studied and described here). As this area of Britain was not subject to glaciation, the plateau remains as a remarkably old landform. Quartz and iron mineralisation can be detected in outcrops and subsoil. The Glenthorne area demonstrates the Trentishoe Formation of the Hangman Sandstone Group. The Hangman Sandstone represents the Middle Devonian sequence of North Devon and Somerset. These unusual freshwater deposits in the Hangman Grits, were mainly formed in desert conditions. The underlying rocks are covered by moors and supported by wet, acid soil. The highest point on Exmoor is Dunkery Beacon; at 519 m it is also the highest point in Somerset.

Lochs of Scotland text item
What follows is a table and related text intended for inclusion in the article List of lochs of Scotland:

Scotland's top 50 lochs
The figures in the table below are mostly taken from Murray and Pullar's Bathymetrical Survey of the Lochs of Scotland (BSLS) conducted at the end of the C19th.

Area: the Survey quoted figures either in acres or else, in the case of the larger lochs, in square miles (and quarter or third fractions thereof). Figures have been converted to square kilometres and rounded to the nearest whole unit. Volume: the Survey offered figures in millions of cubic feet. They have been converted to cubic metres. Maximum depth, mean depth and elevation: BSLS figures quoted in feet have been converted to metres and rounded to the nearest whole unit. The Survey often quotes a range of figures for elevation reflecting adjustments of loch levels to rainfall in which case the mid-point has been selected.

Bathymetrical Survey of the Fresh-Water Lochs of Scotland
The Bathymetrical Survey of the Fresh-Water Lochs of Scotland was conducted between 1897 and 1909 by Sir John Murray and Laurence Pullar. It involved the systematic survey of 562 lochs across the country and was the first and most comprehensive study of its kind in Scotland. Measurements of the surface area, depth, water volume and catchment of each loch were made alongside descriptions of their physical character and biological interest.

A series of coloured maps were published including the lines of soundings - which amounted to several hundred in the case of larger lochs - which permitted contours depicting the bathymetry of each loch to be drawn.

The Survey is still of importance to limnology today.

The Hydrographic Department of the Admiralty undertook soundings in the 1860's on some of the larger lochs and further surveys were conducted during the latter half of the nineteenth century in connection with academic research and plans for providing a water supply for Glasgow.