GEOLOGIC WORK IN ATLANTIC COASTAL PLAIN. In cooperation with the Maryland State Survey, stratigraphic and paleontologic studies were made in Delaware, Maryland, Virginia, and North Carolina for the purpose of correlating the Coastal Plain formations of New Jersey with those of North Carolina. The economic deposits and water-bearing horizons were studied at the same time. As a result of cooperation with the division of hydrology in the investigation of the position and availability of the water-bearing beds of the region, considerable additions were made to the knowledge of the stratigraphy and structure of portions of the Coastal Plain in North Carolina and much valuable paleontologic material was obtained. GEOLOGIC WORK IN EASTERN APPALACHIAN AND PIEDMONT REGIONS. The survey of the West Virginia and Pennsylvania portions of the Pawpaw and Hancock quadrangles was completed and the Quaternary gravels of the Flintstone and Frostburg quadrangles in Maryland were mapped in detail. Special studies were made of the cement resources of Virginia and Alabama, of the Oriskany iron ores of Virginia, and of the brown ores of southwestern Virginia. Brief reports of the results of these investigations were prepared for the annual economic bulletin, and a detailed report on the iron-ore investigations is in preparation. The field work connected with the investigation of the granites and granite industry of Maryland, Virginia, North Carolina, South Carolina, and Alabama was nearly completed, and considerable progress was made in the laboratory study of the rocks. In cooperation with the State Geological Survey of Virginia, a special study was made of the copper resources of the Appalachian region from Virginia southward into Alabama. A brief report on this investigation was published in the annual economic bulletin of the Survey and a full report has been prepared for publication as a special bulletin of the Virginia State Survey. The areal and economic surveys of the Roan Mountain quadrangle in North Carolina and Tennessee, of the Morganton quadrangle in North Carolina, and of the Ellijay quadrangle in Georgia were completed. The text for the Roan Mountain folio and the geologic map for the Ellijay folio were finished and considerable progress was made in the preparation of the text for the Morganton folio. The areal geology of the Dahlonega mining district was mapped in detail and considerable progress made in the preparation of a special economic report, but additional field work will be necessary before this report can be completed. The investigation of the economic resources of the Balsam Mountain region in North Carolina, which was undertaken in cooperation with the North Carolina State Survey, was completed and good progress made in the preparation of the report, which will be published as a bulletin of the Survey and will include a chapter on the copper deposits of the neighboring Cowee quadrangle. In addition, a special report, to be published as a bulletin of the Survey, on the gold belt of South Carolina was completed and submitted for publication. GEOLOGIC WORK IN WESTERN APPALACHIAN REGION. During the year detailed areal and economic surveys of the Punxsutawney, New Castle, and Claysville quadrangles in Pennsylvania, of the Kenova quadrangle in West Virginia and Kentucky, and of the Nicholas quadrangle in West Virginia were completed, and surveys of the Sewickley and Clarion quadrangles in Pennsylvania were started. The study of the physiography and Quaternary geology of the Catatonk quadrangle in New York was completed, and the Watkins GlenCatatonk folio is nearly ready for publication. The manuscripts for the Amity, Rogersville, and Barnesboro-Patton (Pennsylvania) geologic folios and for the following economic bulletins were also completed and submitted for publication: On the oil and gas sands of the Claysville, Burgettstown, and Steubenville quadrangles, Pennsylvania; on the oil and gas of Greene County, Pa.; on the economic resources of the Amity, Pa., quadrangle; on the economic resources of the Kenova quadrangle in Ohio, West Virginia, and Kentucky, and on the Berea grit sandstone of the Steubenville quadrangle in Ohio. Other economic bulletins are in preparation, as follows: On the Pittsburg coal of the Claysville, Burgettstown, and Steubenville quadrangles in Pennsylvania; on the economic resources of the Nicholas, W. Va., quadrangle, and on the coal resources of the BarnesboroPatton region in Pennsylvania. The work in Pennsylvania was done in cooperation with the State. In addition, the following brief reports on economic investigations in this region were prepared for the annual economic bulletin, No. 285: Coal resources of the Kenova quadrangle (Kentucky-Ohio- West Virginia). The Clearfield coal field, Pennsylvania. The Punxsutawney and Glen Campbell coal fields of Indiana and Jefferson counties, Pa. The Nineveh and Gordon oil sands in western Greene County, Pa. Notes on clays and shales in central Pennsylvania. Clay resources of northeastern Kentucky. Clays of western Kentucky and Tennessee. Cement resources of the Cumberland Gap district, in Virginia and Tennessee. Iron ores of Bath County, Ky. GEOLOGIC WORK IN GULF REGION. During the year the study of the red hematite or fossil ores of northern Alabama was completed, and a brief report on the same was prepared for the annual economic bulletin. A large amount of work was also done in the study of the iron ores and other economic resources of the Birmingham district, and in the independent study of the newly discovered gray ore districts in the vicinity of Talladega, Ala. A series of detailed reports on these investigations is now in preparation. A brief report on the Warrior coal basin, in the Birmingham quadrangle, was prepared for the annual economic bulletin. Progress was made in the areal and economic survey of the Brookwood and Birmingham quadrangles, Alabama, but additional field work will be necessary before the reports can be completed. The resurvey, based on paleontologic evidence that made possible a more accurate classification and correlation of the coal-bearing formations, which had heretofore yielded meager faunas, of the southern parts of the McAlester, Tuskahoma, and Windingstair quadrangles, in Indian Territory, was completed. Brief investigations were also made of the oil and gas prospects in the vicinity of Huntsville, Ala., and of the copper deposits of Archer County, Tex. GEOLOGIC WORK IN GREAT LAKES REGION. During the year the detailed areal survey of the Hartford, West Bend, and Poynette quadrangles, in southeastern Wisconsin, made with special reference to the Quaternary geology, was completed, and that of the Baraboo quadrangle was commenced. The manuscript for the Milwaukee Special folio was completed. The revision of the manuscript for a professional paper on the bowlder trains of southcentral Wisconsin and their relations to the glacial formations of the region was completed, but additional critical field studies will be made-it is expected during the present field season-before the manuscript is transmitted to the printer. The glacial formations, ancient lake deposits, soils, surficial and underground waters, and physiographic features of the eastern portion of the upper peninsula of Michigan were studied in the field and mapped, the results being incorporated in a report which will be published as a monograph. In connection with this study considerable additional information was obtained regarding the former extent of the Great Lakes in this region. Additional studies were also made of the lacustrine features of the territory covered by the proposed monograph on the Michigan glacial lobe, but considerable additional work will be necessary to complete this report. In connection with these surveys in Michigan cooperation was carried on with the division of hydrography in an investigation of the underground waters of the State, the results of which will be published in the series of watersupply papers. GEOLOGIC WORK IN MISSISSIPPI VALLEY. During the year the areal and economic survey of the Eureka Springs quadrangle, in Arkansas, was completed and considerable progress made in the preparation of the folio. The manuscript for the Winslow folio, previously surveyed, was also completed and submitted for publication. Progress was made in the general study of the lead and zinc deposits of the Mississippi Valley. A detailed report on the deposits of the upper Mississippi Valley was prepared and submitted for publication, and other reports are in preparation. In connection with this study special paleontologic investigations were made for the purpose of elucidating stratigraphic problems which have a direct bearing upon the distribution of these metals. A detailed paleobotanical microscopic examination was made of samples of the oil shales which are associated with the lead and zinc deposits of southwestern Wisconsin, for the purpose of determining the causes of the localization of the hydrocarbons that seem to have influenced the distribution of the ores. As this investigation seems likely to offer a satisfactory explanation of the origin of the oil and gas in the older Paleozoic rocks, plans have been made to continue it and extend it to some of the areas of Ordovician and Silurian oil and gas. In April a general reconnaissance of the Carboniferous coal field of Arkansas was undertaken and is still in progress. Brief reports on the glass sand of the middle Mississippi basin and on the clays of Garland County, Ark., were prepared for the annual economic bulletin. GEOLOGIC WORK IN ROCKY MOUNTAIN AND PACIFIC STATES. In the Rocky Mountain and Pacific States-a region that presents complex geologic problems and is rich in metalliferous and other economic resources-many surveys and investigations were carried on. These group themselves into the following classes: Areal and stratigraphic studies; glacial and physiographic studies; investigations of gold, silver, lead, and copper deposits; fuels; iron ores; miscellaneous economic deposits. Areal and stratigraphic studies.-The Santa Cruz (California) geologic folio and a bulletin on the geology of the Taylorsville (Cal.) region were completed and submitted for publication. The mapping of the Corona quadrangle, in southern California, was also completed. 27 GEOL-06- -2 The Corona is the first of a series of quadrangles, comprising the Hesperia, Deep Creek, San Bernardino, Redlands, and one (unnamed) which includes the south end of the Tehachapi Mountains at the point of their junction with the Coast Ranges, which have been selected for early mapping, because it is believed they will furnish the key to the general geology of this section of the State. A geologic reconnaissance from the southern borders of the San Joaquin Valley in California northward to the south line of Merced County resulted in the preparation of a report designed to be published as a bulletin of the Survey, but it is probable that the report will not be published until the additional work necessary to complete the reconnaissance of the valley north of Suisun Bay has been done. In Colorado about half of the Lake City quadrangle was surveyed in detail, some preliminary work was done in the neighboring San Cristobal quadrangle, and a reconnaissance was made of the Uncompahgre plateau for the purpose of elucidating certain stratigraphic problems. Special studies included one on the stratigraphy of the Cretaceous rocks of the Routt County coal field and another on the Morrison formation and overlying strata near Canyon, the latter being a continuation of a study of the same beds in New Mexico and southern Colorado which was made earlier in the season. In connection with the completion of the detailed survey of the Cœur d'Alene mining district, which was begun the preceding field season, a stratigraphic reconnaissance was made in northern Idaho and northwestern Montana, the general results of which are incorporated in the economic report on the Coeur d'Alene district, which is nearly ready for publication. Progress was made in the study of the marine Tertiary fauna of the Pacific coast, which has been of fundamental importance in determining the petroleum horizons of that region. As a result of the field work in, this connection several geologic reconnaissance maps were prepared of areas studied, chiefly within the counties of Fresno, Kern, King, and San Luis Obispo, in California. Glacial and physiographic studies. Special glacial and physiographic work in this region included the completion of the report on the glaciation of the Uinta Mountains, Utah, which was submitted for publication, and the preparation of a bulletin on the landslides and rock streams of the San Juan region, Colorado, which is nearly ready for publication. Considerable progress was also made in the determination of the maximum glaciation of the Sierra Nevada, a problem of great scientific interest; but much additional field work will be necessary before a satisfactory report can be prepared. Investigations of gold, silver, lead, and copper deposits.-The revival of mining activity in Nevada and the recent development of several new and important districts in the southwestern part of the State have |