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The Ancient Volcanic Rocks of South Mountain, Pennsylvania

Description: From introduction: In December, 1892, as the result of field work on the part of Dr. G. H. Williams in the northern and of the writer in the southern portion of South Mountain, there appeared a preliminary description of two of the rock types, in which their identification as ancient volcanics was announced. In this bulletin it is proposed to substantiate that identification with more detailed proof. It is further proposed to show that these ancient igneous rocks were, at the time of their consolidation, identical in character with their recent volcanic analogues, and that their present differences are due to subsequent changes, chief among which has been devitrification. It is also proposed to recognize these facts in the nomenclature.
Date: 1896
Creator: Bascom, Florence

The Cambrian Rocks of Pennsylvania

Description: From introduction: In his report on the Geology of Pennsylvania,' Professor Lesley summarizes his opinion upon the geology of the South Mountains and Formation No. 1. In this, Formation No. 1 is referred to the Upper Cambrian, and a detailed description is given of its occurrence along the South Mountains and across the State to the Delaware. The superjacent limestone, No. 2, is referred to the Ordovician.' Fuller reference will be made to Professor Lesley's descriptions in speaking of the rocks of York County.
Date: 1896
Creator: Walcott, Charles Doolittle

The Colorado Formation and its Invertebrate Fauna

Description: From preface: The following review of one of the Upper Cretaceous faunas as developed in the interior region of the United States has grown out of the study of a collection of fossils found by me in Huerfano park and adjacent localities in southern Colorado. This collection, the greater part of which was obtained during the summer of 1890, proved to be especially interesting because it afforded data for the closer correlation of certain Cretaceous strata in Utah with those east of the mountains, besides adding a considerable number of new species to the fauna of the Colorado formation. Dr. C. A. White, under whose direction the field work was done, generously assigned these fossils to me for study with a view to publishing the results, and I am greatly indebted to his sympathetic aid in every phase of the work.
Date: 1893
Creator: Stanton, Timothy W.

The Constitution of the Silicates

Description: A report about silicates which form nine-tenths of the earth's crust and are therefore of fundamental importance to geological changes. The report discusses analyzing them by finding out where they came from and what they are comprised of.
Date: 1895
Creator: Clarke, Frank Wigglesworth

Correlation Papers: Archean and Algonkian

Description: From outline: This hook is a review of the present state of knowledge of the general structure of the pre-Cambrian rocks of the United States and Canada. The material contained in the historical chapters is of two kinds: Summaries of all articles pertaining to the subject considered, and summaries of the conclusions which appear to be established. The first represents the substance of the literature; the second brings together the important ascertained structural facts, and often times becomes a more or less extended discussion. The final chapter covers the same grounds as the historical chapters for the various pre-Cambrian in general successions proposed by different authors, and also contains a discussion of results and the principles upon which they are based. Within the chapters, individual districts or regions are given separate sections, and the summary of literature for each is arranged in chronological order.
Date: 1892
Creator: Van Hise, Charles Richard

Correlation Papers: Cambrian

Description: From outline: This work is a review, by one who is working in the Cambrian field, of the work of his predecessors, and of the results they and he have thus far obtained as he interprets them. It thus becomes historical and descriptive, and is a general statement of the principles upon which the correlations have been made in establishing the group.
Date: 1891
Creator: Walcott, Charles Doolittle

Correlation Papers: Cretaceous

Description: From outline: The primary object of this bulletin is the presentation of a summary of our present knowledge of the North American Cretaceons and a discussion of the system as it is developed on this continent, discussion of or direct reference to the details of the system as it is developed in other parts of the world being omitted.
Date: 1891
Creator: White, Charles A.

Correlation Papers: Neocene

Description: From outline: This paper, after discussing general principles connected with the study and description of the Tertiary or Cenozoic rocks and fossils contained in them, takes up the Neocene deposits of the United States in particular. A chapter is devoted to a summary of what is known in regard to the Neocene of the eastern coast of the United States, each State in geographical order being separately considered, beginning at the north.
Date: 1892
Creator: Dall, William Healey & Harris, Gilbert Dennison

Correlation Papers: the Newark System

Description: From outline: The aim of this paper is to review the progress of our knowledge concerning a well defined system of rocks on'the Atlantic border, named the Newark system; to summarize the present state of information concerning it, and to discuss the bearing that its study has on principles of correlation.
Date: 1892
Creator: Russell, Israel Cook

The Devonian System of Eastern Pennsylvania and New York

Description: Introduction: By way of introduction a section will be described across the Devonian of the northeastern part of Monroe County, Pa., along the line of Brodhead Creek and the Delaware, Lackawanna and Western Railroad. The base of this section will rest on the Corniferous limestone well exposed in a railroad cut a mile south of East Stroudsburg and the termination will b6 in the Pocono, as exposed on the Pocono Mountains, from Mount Pocono to the ridge northwest of Tobyhanna.
Date: 1894
Creator: Prosser, Charles S.

A Dictionary of Geographic Positions in the United States

Description: From introduction: For several years the Division of Topography of the United States Geological Survey has been engaged in compiling positions determined within the United States which are believed to be of sufficient accuracy for use in the preparation of its maps. This compilation has been found extremely useful in the office, and it is believed that its usefulness will be greatly extended by placing it before the public. This list comprises between 9,000 and 10,000 positions. To publish it in extenso, with descriptions of the stations, their latitudes and longitudes, the distances and azimuths to neighboring stations, and the methods of determination, would extend this bulletin beyond all reasonable limits. To avoid making too bulky a volume, it has been decided to publish merely the latitudes and longitudes, with abbreviations indicating the authority, and references to the publications in which other data relating to the positions may be found.
Date: 1895
Creator: Gannett, Henry

The Disseminated Lead Ores of Southeastern Missouri

Description: From letter of transmittal: The results contained in this report are the product of investigations conducted during the past three months. These investigations were in extension of the work on which was based my report, as State geologist of Missouri, on the lead and zinc deposits of the whole State.
Date: 1896
Creator: Winslow, Arthur

Earthquakes in California in 1893

Description: A report about recorded shock waves observed or felt on Mount Hamilton, and all those reported to the Lick Observatory by letter, as well as newspaper reports of such earthquakes that occurred in California during that year.
Date: 1894
Creator: Perrine, Charles D.