Все разделы
  • @
  • «»{}∼
Contributions to the Mineralogy of the Newark Group in Pennsylvania, Vol. 7

Contributions to the Mineralogy of the Newark Group in Pennsylvania, Vol. 7

138577698
1062.5 руб.
Добавить в корзину
Описание
Excerpt from Contributions to the Mineralogy of the Newark Group in Pennsylvania, Vol. 7: January, 1910

The trap masses are, as already mentioned, indicated by prominent elevations, although they can not be accurately mapped on this basis, for in places the sedimentary rocks are exposed far up the flanks of the hills, and again the trap descends to the level of the streams. The exact boundaries between the trap and Shale can, however, be determined by the character of the soil, especially in the case of the northern mass, where the change from red-brown shale soil to the yellow of that derived from the trap is particularly marked. The present map, representing the results of some two weeks of 'field work, has been prepared as carefully as possible with this point in view.

The section through these hills cut by Antietam Creek affords the best View of their character and structural relations, and may therefore be described in detail. Starting from Wamsher's Mill, on the east side' of the creek, one mile north of Lorane Station, on the Philadelphia and Reading Railway (called Exeter on the older maps), and proceeding northwards along the mill-race, the first rock encountered is a bright red sandy shale, dipping 30° north 30° east. With this there are interbedded several layers of' limestone-pebble conglomerate, showing that the large area of this rock to the west does not end in a rounded point, as indicated on the previous maps, but thins out gradually and is replaced eastward by the Shale. A lens of yellow sandstone is also ex posed here, containing an abundance of plant remains, apparently pieces of leaves and stems, but in too fragmentary condition for determination.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Эта книга будет изготовлена в соответствии с Вашим заказом по технологии Print-on-Demand компанией ООО «Книга по Требованию». Print-on-Demand - это технология печати книг по Вашему заказу на цифровом типографском оборудовании. Книга, произведенная по технологии Print-on-Demand (POD) представляет собой классическую печатную книгу с соблюдением всех стандартов качества, от офсетной бумаги и плотного картона до качественного клея, используемого при изготовлении. Черно-белая текстовая или полноцветная иллюстрированная книга (в зависимости от исходного файла, подготовленного к печати) может быть изготовлена в разных вариантах: - в мягкой обложке (Клеевое Бесшвейное Скрепление); - скрепление скобой (для книг с небольшим количеством страниц); - в твердом переплете с клееным текстовым блоком; Материалы, используемые при производстве книги: - бумага текстового блока - офсетная (белая или кремовая) 80 г/м2 - мягкая обложка - бумага мелованная 250 г/м2; - ламинация обложки - матовая или глянцевая; - твердый переплет - картон 2 мм, каптал, белые форзацы, прямой корешок - сверхпрочный полимерный клей; - каждая книга упакована в термопленку. Каждый заказ обрабатывается в индивидуальном порядке: каждой книге, напечатанной по технологии Print-on-Demand, присваивается уникальный номер.