Further reliques of Constance Naden : being Essays and tracts for our times / edited, with an naalytical and critical introduction, and notes, by George MMcCrie . ese are pierced by four principal dykes of diorite,but are not greatly altered. Their chief fossils are—Agnostus pisiformis, A. req. Lingulella ferrugina,Obolella(Sp.), Discina Caerfarensis, Beyrickia angelina,sponge spicules, Dictyonema and worm these fossils the shales seem to be in the lowerdivision of Upper Cambrian.(4) The Wrekin. (a) Cambrian quartzite here lies upon the rhyolites,large fragments of which arc conta
Further reliques of Constance Naden : being Essays and tracts for our times / edited, with an naalytical and critical introduction, and notes, by George MMcCrie . ese are pierced by four principal dykes of diorite,but are not greatly altered. Their chief fossils are—Agnostus pisiformis, A. req. Lingulella ferrugina,Obolella(Sp.), Discina Caerfarensis, Beyrickia angelina,sponge spicules, Dictyonema and worm these fossils the shales seem to be in the lowerdivision of Upper Cambrian.(4) The Wrekin. (a) Cambrian quartzite here lies upon the rhyolites,large fragments of which arc contained in its lowestbeds. It is not fossiliferous. (b) Next comes a bed equivalent to the Holly bush GEOLOGY OF THE BIRMINGHAM DISTRICT. 29 Sandstone of the Malverns (identified from its fossils by Dr. Callaway).(c) Upon these sandstones, but separated from them bya fault, lie beds supposed to be equivalent to theSlimeton (Tremadoc) Shales. Their fossils arcAsaphillus Homfrayi, Lingullella, &c. Rhyolhi £*!** Qu Hollvbush ^*4^f Qlf Trian fAshes >• Smulstatw S «-H-^ N i Shineton wenloc vnes / wre%kin ! : Coal .1/. SECTION OF THE WREKIN DISTRICT. It may be observed that the English Cambrians crop outalong the axes of buried mountain ranges—, rangesworn down by the action of rain and rivers, and partiallyobliterated by the disposition of newer formations upon theirflanks. (II) SILUEIAN KOCKS. Characteristic fossil genera:— Hyclrozoa. — Monograpous, Cyrtograpous, Eastrites.(These Graptolites are all single, proceeding from theroot in one direction only.)Actinozoa.—Halysites, Favosites, Cyathophyllum, Helio- —Pentamerus (, P. Oblongus, P. Knightii) Atrypa (Brachiopods), Orthoceras (Cephalopod).Crustacea.—Phacops, Homalonotus, Illaenus (Trilobites),Eurypterus and Pterygotus (Phyllopods).Divisions of Silurian : (ft) Llandovery Piocks (Sandstones):Lower \ Middle > containing Pentamerus leus and / 30 GEOLOGY OF THE BIRMINGHAM
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