File:The Quarterly journal of the Geological Society of London (1881) (14770707215).jpg

Identifier: quarterlyjourna371881geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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district, being, in fact, there represented by a great strati-graphical break—Sedgwicks original May-Hill unconformity. I conclude that, while in the latest Cambrian times (Sedgw.) and thedawn of the Silurian era the elevatory forces, acting in a north-and-south direction, lifted up the sea-bed to form a land-surface over thewest of England and the Welsh borders, these forces influenced thegreater part of Wales only in a less degree—producing, it may be,the shallower water in which the Aberystwyth grits were laid down,but not interfering with the continuous deposition of sediment andthe unbroken sequence of the geological record from the Cambrianto the Silurian eras. Vales. )rth, F.G., Taren j Gesail. El PaE DT<E Table showing Distribution of Fossils in Central WiSpecimens marled thus (t) bare been idculiQed bj Mr. 0. Lapmir - analaiis, Lap*. Cladophora.- QJtTBgafcJlam, Lapr. , jFtS* iirklull of .South Kf»llmnl if.upwliale and its equivaliTits (Lapvi.)it ;mf) Oirv.in ilAtpw.).
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ON SOME NEW SPECIES OE CLADOPHORA. 171 Appendix. Oa the Cladophora (Ilopk.) or Dendroid Graptolites collected byProfessor Keeping in the Llandovery Modes of Mid Wales. ByChas. Lapworth, Esq., F.G.S. &c. (Plate VII.) The forms of Cladophora collected by Professor Keeping fromthe Llandovery rocks of Cardiganshire are, regarded collectively^ ofa type almost new to British palaeontology. Although intimatelyallied to the well-known dendroid species of the Quebec and Arcnigformation, they are very distinct in their minor features. They areessentially of a Silurian (Upper) facies, and they remind us stronglyof a group recently made known to us through the researches of Mr.Spencer, of Toronto, which characterizes the Clinton and NiagaraGroups of New York and Upper Canada *. None of our examples shows the complete polypary, or affords dis-tinct proof of the presence of all the more minute classificatoryfeatures; but there is satisfactory evidence of the presence of atleast four distinct ge

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