Transactions of the Geological Society (Paperback)


This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1829 Excerpt: ...rock which has been designated as graystone, by strata of loose conglomerate, chiefly composed of pumice, and which may belong in part to both the under and overlying formations, since their disposition in the Chiaja di Luna proves them to have been deposited at two different periods. In Palmarola the stratified tufa must be supposed to belong to the trachyte, since in this island graystone is wanting. The mineralogical characters by which this last rock (graystone) distinguishes itself from the subjacent trachyte have been already sufficiently enumerated. Its frequent occurrence in Ischia, Procida, and the volcanic district round Naples, has been also mentioned; and in the Scoglio della Botte and the islands Ventotiene and San Stefano, we see a series of similar rocks geographically connecting these localities with that of the Montagna della Guardia in Ponza. The huge mass of graystone of this mountain, resting at a great height upon stratified tufa on that face of the hill which overlooks the basin of the harbour, and on the other side following the inclination of these strata in a rapid descent below the level of the sea, has precisely the figure and disposition of a lava-current. The bed of graystone which forms the substratum of Ventotiene has even more decidedly the form and aspect of a mass which has flowed down an in VOL. II.--SECOND SERIES. 2 H clined plane in a state of imperfect fluidity. The Capo del Arco is the source of this current, its superior elevation and the scorified nature of its rocks attesting the proximity of the orifice of production. Whatever accumulations of ejected matter may once have been formed to the west of this cape, may naturally be supposed to have disappeared under the erosive attacks of the sea, whose waves continue st...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1829 Excerpt: ...rock which has been designated as graystone, by strata of loose conglomerate, chiefly composed of pumice, and which may belong in part to both the under and overlying formations, since their disposition in the Chiaja di Luna proves them to have been deposited at two different periods. In Palmarola the stratified tufa must be supposed to belong to the trachyte, since in this island graystone is wanting. The mineralogical characters by which this last rock (graystone) distinguishes itself from the subjacent trachyte have been already sufficiently enumerated. Its frequent occurrence in Ischia, Procida, and the volcanic district round Naples, has been also mentioned; and in the Scoglio della Botte and the islands Ventotiene and San Stefano, we see a series of similar rocks geographically connecting these localities with that of the Montagna della Guardia in Ponza. The huge mass of graystone of this mountain, resting at a great height upon stratified tufa on that face of the hill which overlooks the basin of the harbour, and on the other side following the inclination of these strata in a rapid descent below the level of the sea, has precisely the figure and disposition of a lava-current. The bed of graystone which forms the substratum of Ventotiene has even more decidedly the form and aspect of a mass which has flowed down an in VOL. II.--SECOND SERIES. 2 H clined plane in a state of imperfect fluidity. The Capo del Arco is the source of this current, its superior elevation and the scorified nature of its rocks attesting the proximity of the orifice of production. Whatever accumulations of ejected matter may once have been formed to the west of this cape, may naturally be supposed to have disappeared under the erosive attacks of the sea, whose waves continue st...

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Product Details

General

Imprint

Rarebooksclub.com

Country of origin

United States

Release date

March 2012

Availability

Supplier out of stock. If you add this item to your wish list we will let you know when it becomes available.

First published

March 2012

Authors

Dimensions

246 x 189 x 11mm (L x W x T)

Format

Paperback - Trade

Pages

198

ISBN-13

978-1-130-07758-2

Barcode

9781130077582

Categories

LSN

1-130-07758-6



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