Part 56 (1/2)

23. Middle Trias { Compact greyish limestone } With Equiset.i.tes or { with beds of dolomite and } and Calamite.

Muschelkalk. { gypsum,--North of Germany, } { p. 287. Wanting in } { England. }

24. Lower Trias. { Variegated or Bunter sandstone } Plants different for { of Germans--Red and white } the most part from { spotted sandstone with } those of the Upper { gypsum and rock-salt, P. 288 } Trias.

{ } { Part of New Red sandstone of } { of Ches.h.i.+re with rock-salt, } { p. 294. }

IV. PRIMARY.

K. PERMIAN.

25. Upper Permian. { Yellow magnesian limestone, } Organic remains, both { Yorks.h.i.+re and Durham, } animal and vegetable, { P. 301. } more allied to primary { } than to secondary { Zechstein of Thuringia, Upper } periods.

{ part of Permian beds, } { Russia. }

26. Lower Permian. { _a._ Marl slate of Durham and } Thecodont saurians.

{ Thuringia. } Heterocercal fish of { } genus Palaeoniscus, &c.

{ _b._ Lower New Red sandstone } { of north of England and } { Rothliegendes of Germany. } { } { _a._ and _b._ Lower part of } { Permian beds, Russia, } { p. 301. }

L. CARBONIFEROUS.

27. Coal measures. { _a._ Strata of sandstone and } Great thickness of { shale, with beds of } strata of { coal,--S. Wales and } fluvio-marine origin, { Northumberland, p. 309. } with beds of coal of { } vegetable origin, { _b._ Millstone grit,--S. } based on soils { Wales, Bristol coal-field, } retaining the roots { Yorks.h.i.+re, p. 308. } of trees.

} } Oldest of known reptiles } or Archegosaurus.

} Sauroid fish.

28. Mountain { Carboniferous or mountain { Brachiopoda of genus limestone. { limestone, with marine { Productus.

{ sh.e.l.ls and corals. { { { Cephalopoda of genera { Mendip Hills, and many parts { Cyrtoceras, Goniat.i.te, { of Ireland, p. 340. { Orthoceras.

{ { Crustaceans of the { genus Phillipsia.

{ { Crinoideans abundant.

M. DEVONIAN.

29. Upper { _a._ Yellow sandstone of Dura } Tribe of fish with hard Devonian. { Den, Fife. } coverings like { } chelonians, { _b._ Red sandstone and marl } Pterichthys, { with cornstone of } Pamphractus, &c.; { Herefords.h.i.+re and } also of genera { Forfars.h.i.+re. } Cephalaspis, { } Holoptichius, &c.

{ Paving and roofing-stone, } { Forfars.h.i.+re. } No reptiles yet known.

{ } { Upper part of Devonian beds } { of South Devon. }

30. Lower { Grey sandstone with } Fish, partly of same Devonian. { Ichthyolites,--Caithness, } genera, but of { Cromarty, and Orkney, Lower } distinct species from { part of Devonian beds of } those in Upper { South Devon, and green } Devonian; also { chloritic slates of } Osteolepis, { Cornwall, limestone of } Coccosteus, { Gerolstein, Eifel. } Glyptolepis, } Dipterus, &c.

N. SILURIAN.

31. Upper { _a._ Tilestone of Brecon and { Oldest of fossil fish Silurian. { Caermarthen. { yet discovered.

{ { { _b._ Limestone and shale, { Trilobites and { Ludlow, Shrops.h.i.+re. { Graptolites abundant.

{ { { _c._ Wenlock or Dudley { Brachiopoda very { limestone. { numerous.

{ { Cephalopoda: { Bellerophon, { Orthoceras.

{ Same genera of 32. Lower { _a._ Caradoc sandstone, Caer { invertebrate animals Silurian. { Caradoc, Shrops.h.i.+re. { as in Upper Silurian, { { but species chiefly { _b._ Llandeilo flags, { distinct. Trinucleus { calcareous flags and { caractaci, Cystideae, { schists,--Builth, { p. 358.