File:The Quarterly journal of the Geological Society of London (13937295321).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937295321).jpg |
COTTESWOLD, MIDFOKD, AND YEOVIL SANDS, ETC. 457 On the other hand the " Midford Sands " have been defined as equal to the zones of Amm. ojpalinus and Amm. jurensis * ; but, in all probability, the lower part of the Cotteswold Sands — the part containing Amm. bifrons — belongs to the Commune-zone. Then, too, it is just the opposite in Somerset, where it is the Upper-Lias Clay of Ilminster which contains the greater part of the Jurense-zone. Again, part of the Inferior-Oolite Limestone of Dorset and of the Cotteswolds is in the zone of Amm. opalinus. Therefore this latter definition does not coincide with the first. According to either view we arrive at an absurdity, namely, part of the Upper-Lias Clay must be in the Inferior Oolite series ; or beds containing several of the same species of Ammonites must be in the Lias in one place, and in the Inferior Oolite in another. After all, the term " Midford Sands " is only used locally. The Dogger Sands of Yorkshire, and part of the Northampton Sands, are contemporaneous with the upper part of the Yeovil Sands ; but they are not included in the term " Midford Sands." Is there the least advantage in retaining a term — a merely local term — which, as I have shown, includes deposits that are, by no means, contempor- aneous? Its only advantage is that it does away with two names; but the result is absolute inaccuracy. The terms Cotteswold, Mid- ford, and Yeovil Sands may be retained as merely local names for certain deposits, in the same way as Pea-grit, Oolite Marl, &c. ; they should have no wider signification than the district to which they apply, and should not be used where strict scientific accuracy is required, but should give place to their zonal equivalents. It would almost seem as if the sands between Liassic Clay and Oolitic Limestone were a somewhat singular deposit ; but the fact of the matter is, that from a rather remote period until a much later one than we are treating of, sandy strata have been deposited — in no two districts contemporaneously, but generally first in one place and then in another. Why, then, is it desired to mark off the " Midford Sands " as a distinct series — not all across England, but only locally ? The Jamesoni- and Caprleornum- zones are characterized by mica- ceous and sandy shales at Eobin Hood's Bay in Yorkshire t. The Henley i-zone in Gloucestershire is largely made up of sandy strata very similar to the Cotteswold Sands. The Margaritatus- and Spinatus-zones in Dorset contain sandy strata often undistingnishable from the Yeovil Sands. The zone of Amm. annulatus in Yorkshire is represented by hard and compact, grey and micaceous sandy shale t. What is probably the upper part of the Commune-zone is com- posed of micaceous sands in Gloucestershire. The Jurense-zone is made up of sands at Bath, while, lastly, the OpaUnum-zone at Burton Bradstock is chiefly sands. Passing to the continent, Oppel § shows us that at Wasseralfingen H. B. Woodward, op. cit. p. 285. f H. B. Woodward, op. cit. p. 269. |
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Source | https://www.flickr.com/photos/biodivlibrary/13937295321 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940280 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Figs. 1-2 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940280 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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