ABBREVIATIONS.
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ABBREVIATIONS USED FOR THE DIFFERENT STRATA.
TERTIARY OR CAINOZOIC SERIES .
Pl.M. Pleistocene Marine, including the raised beaches and the elevated depositscontaining marine shells, most of which are of existing species.
Pl.F. Pleistocene Freshwater, including the fluviatile or lacustrine deposits, contain-ing mammalian remains, &c., as the Thames valley, &c.
M.Cr. Mammaliferous or Norwich Crag. R.Cr. Red Crag. C.Cr. Coralline Crag,U.Eo. The Hempstead and Bembridge series, Isle of Wight. M.Eo. Fresh-water and marine formations of Headon Hill, Hordwell Cliff, &c., Hamp-shire ; Bagshot, Bracklesham, and Barton series. L.C1. London Clay, andBognor rock. L.Eo. Clays and Sands of Woolwich, Reading, &c.; andThanet Sands.
SECONDARY OR MESOZOIC SERIES.
Cretaceous Group.
U.Ch. Upper Chalk. L.Ch. Lower Chalk. Ch.M. Chalk Marl. U.GS. UpperGreensand. Git . Gault. L.GS. Lower Greensand. S.C1. Speeton Clay.
Wealden Group.
Wld. Wealden formation, includingHastings Sand, Tilgate Grit, &c. Pbk. Purbeckbeds of Dorset and Wiltshire.
Jurassic Group.
Pld. Portland Stone and Sand . Kim. Kimmeridge Clay. Cor. Calcareous Grit,and Coral Rag. Oxf. Oxford Clay. Kel. Kelloways Rock. Cbr. Cornbrash.For.M. Forest Marble, and Bradford Clay. Gr.O. Great Oolite, and Stones-field Slate. F.E. Fuller’s Earth. Inf.O. Inferior Oolite. Lias. Includingthe upper and lower lias, shales, and marlstone.
Triassic Group.
Trs. Including the variegated marls, Keuper , and Bunter-sandstein.
Permian Group.
Prm. Magnesian Limestone, gypseous marls, and Lower New Red Sandstone.
Carboniferous Group.
C.M. Coal-measures. C.Sh. Carboniferous Shales. C.L. Carboniferous Limestone,including the Yoredale and Scar limestones of Yorkshire , &c.
Devonian Group.
Dev. Old Red Sandstone, and Devonian shales and limestones.
Silurian Group.
U.Sil. Upper and Lower Ludlow and Aymestry Limestone; and Wenloek or DudleyLimestone, and Shale. L.Sil. Caradoc Sandstone; Llandeilo and BalaFlags and Limestone ; and Lingula beds.
Camb. Cambrian group.