 ... in the Buffalo Valley synclinal north of Lewisburg, where perhaps the whole of the Marcellus formation exists, but little if any of the overlying Hamilton. The Marcellus black slate has been a very fruitful source of disaster to several coal mining...  Report of Progress - Seite 47von Geological Survey of Pennsylvania - 1891Vollansicht - Über dieses Buch
 | Pennsylvania. Department of Forestry - 1915 - 540 Seiten
...fruitful source of disaster to several coal mining companies in the district, which have labored long to find coal in them. Every effort has proved a failure, as well as in the Hudson River and Utica slate formations of III. The rocks of formation VI outcrop through Gregg... | |
 | Pennsylvania. Department of Forestry - 1915 - 540 Seiten
...fruitful source of disaster to several coal mining companies in the district, which have labored long to find coal in them. Every effort has proved a failure, as well as in the Hudson River and Utiea slate formations of III. The rocks of formation VI outcrop through Gregg... | |
 | Pennsylvania. Department of Forests and Waters - 1915 - 538 Seiten
...fruitful source of disaster to several coal mining companies in the district, which have labored long to find coal in them. Every effort has proved a failure, as well as in the Hudson Eiver and Utica slate formations of III. The rocks of formation VI outcrop through Gregg... | |
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