Keuper sentence example
- Another well-known bed, formerly known as the "Bristol" or "Lias" Bone Bed, exists in the form of several thin layers of micaceous sandstone, with the remains of fish and saurians, which occur in the Rhaetic Black Paper Shales that lie above the Keuper marls in the south-west of England.
- Most of the southern part of the county is occupied by Keuper marls and sandstones, the latter yield good building stone; and at Chellaston the gypsum beds in the former are excavated on a large scale.
- The Keuper clays yield material for bricks.
- Spherosiderites and brown iron ores are plentiful also in the " Keuper formation."
- In England extensive deposits of rock-salt are found near the base of the Keuper marl, especially in Cheshire.Advertisement
- Such casts are not infrequent in the Keuper marls and sandstones, and in the Purbeck beds of England.
- The plain sweeps round south of the Lancashire coal-field, forms the valley of the Mersey from Stockport to the sea, and farther south in Cheshire the salt-bearing beds of the Keuper marls give rise to a characteristic industry.
- The " Waterstones," or Lower Keuper Sandstones, - forming gentle elevations above the softer marls, and usually charged with an abundant supply of water, which can be reached by wells, - form the site of many towns, such as Birmingham, Warwick and Lichfield, and of very numerous villages.
- Next in importance to the Chalk formations as a source of underground water supply comes the Trias or New Red Sandstone, consisting in Great Britain of two main divisions, the Keuper above and the Bunter below.
- With the exception of the Red Marls forming the upper part of the Keuper, most of the New Red Sandstone is permeable, and some parts contain, when saturated, even more water than solid chalk; but, just as in the case of the chalk, a well or borehole in the sandstone yields very little water unless it strikes a fissure; hence, in New Red Sandstone, also, it is a common thing to form underground chambers or adits in search of additional fissures, and sometimes to sink many vertical boreholes with the same object in view.Advertisement
- There are cases also where sedimentary rocks, formed below the sea or salt lagoons, are almost impermeable: thus the salt deposited in parts of the Upper Keuper of the New Red Sandstone, is protected by the red marls of the formation, and has never been washed out.
- The lowest is the Triassic Keuper found in the Isle of Axholme and the valley of the Trent in the form of marls, sandstone and gypsum.
- Bunter, Permian, and Coal Measure strata have been revealed by boring to underlie the Keuper near Haxey.