A Gazetteer of Texas (open access)

A Gazetteer of Texas

Geological and geographic survey and analysis of Texas at the onset of the 20th century. Also includes an index of place names in Texas.
Date: 1904
Creator: Gannett, Henry
Object Type: Book
System: The Portal to Texas History
Spirit Leveling in Texas: Part 2. The Panhandle, 1896-1939 (open access)

Spirit Leveling in Texas: Part 2. The Panhandle, 1896-1939

Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Date: 1942
Creator: Staack, J. G. (John George), 1878-
Object Type: Report
System: The UNT Digital Library
Spirit Leveling in Texas: Part 3. West-central Texas, 1896-1938 (open access)

Spirit Leveling in Texas: Part 3. West-central Texas, 1896-1938

Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Date: 1941
Creator: Staack, J. G. (John George), 1878-
Object Type: Report
System: The UNT Digital Library
Spirit Leveling in Texas: Part 5. South-central Texas, 1896-1938 (open access)

Spirit Leveling in Texas: Part 5. South-central Texas, 1896-1938

Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Date: 1941
Creator: Staack, J. G. (John George), 1878-
Object Type: Report
System: The UNT Digital Library
Spirit Leveling in Texas: Part 4. North-central Texas, 1896-1938 (open access)

Spirit Leveling in Texas: Part 4. North-central Texas, 1896-1938

Report discussing the figures of elevations determined by spirit leveling across particular quadrangles in Texas.
Date: 1942
Creator: Staack, J. G. (John George), 1878-
Object Type: Report
System: The UNT Digital Library
On the Fossil Faunas of the Upper Devonian: the Genesee Section, New York (open access)

On the Fossil Faunas of the Upper Devonian: the Genesee Section, New York

From letter of transmittal: The present report includes special discussion of the faunas of the Hamilton group and of those below the black shales of the Genesee group is omitted.
Date: 1887
Creator: Williams, Henry Shaler
Object Type: Report
System: The UNT Digital Library
Tertiary and Cretaceous Strata of the Tuscaloosa, Tombigbee, and Alabama Rivers (open access)

Tertiary and Cretaceous Strata of the Tuscaloosa, Tombigbee, and Alabama Rivers

From preface: This bulletin is based upon the observations of the Tertiary and Cretaceous strata exposed along the Tuscaloosa, Tombigbee, and Alabama Rivers in the state of Alabama.
Date: 1887
Creator: Smith, Eugene Allen & Johnson, Lawrence C.
Object Type: Report
System: The UNT Digital Library
Stratigraphy of the Bitmuninous Coal Field of Pennsylvania, Ohio and West Virginia (open access)

Stratigraphy of the Bitmuninous Coal Field of Pennsylvania, Ohio and West Virginia

From introduction: This report deals with the Middle and Upper Carboniferous System.
Date: 1891
Creator: White, Israel C.
Object Type: Report
System: The UNT Digital Library
The Gabbros and Associated Hornblende Rocks Occurring in the Neighborhood of Baltimore, Maryland (open access)

The Gabbros and Associated Hornblende Rocks Occurring in the Neighborhood of Baltimore, Maryland

From introduction: The present paper is intended as a contribution to our knowledge of a particular phase of metamorphism in eruptive rocks, i.e., that one which is dependent on the secondary development of hornblende by the paramorphism or pseudomorphism of pyroxene.
Date: 1886
Creator: Williams, George Huntington
Object Type: Report
System: The UNT Digital Library
The Lignites of the Great Sioux Reservation : a Report on the Region Between the Grand and Moreau Rivers Dakota (open access)

The Lignites of the Great Sioux Reservation : a Report on the Region Between the Grand and Moreau Rivers Dakota

From introductory: Report of the survey party on the Great Sioux Reservation for determining any coal-beds of economic value.
Date: 1885
Creator: Willis, Bailey
Object Type: Report
System: The UNT Digital Library
Preliminary Report on the Geology and Water Resources of Central Oregon (open access)

Preliminary Report on the Geology and Water Resources of Central Oregon

From introduction: The observations recorded in this paper were made during a rapid reconnaissance from east to west through the central part of Oregon in the summer of 1903, and are in continuation of similar work in the same general region previously done by the author, reports concerning which have been published.
Date: 1905
Creator: Russell, Israel C.
Object Type: Report
System: The UNT Digital Library
Ancient Lavas in Shenandoah National Park Near Luray, Virginia (open access)

Ancient Lavas in Shenandoah National Park Near Luray, Virginia

Abstract: In the Blue Ridge Province of northern Virginia, Maryland, and southern Pennsylvania, Lower Cambrian beds are underlain by a thick sequence of greenstone and interbedded sedimentary rocks known as the Catoctin Formation. An area near Luray, Va., was studied to determine the thickness of the formation, its relationship to overlying and underlying rocks, and the original nature of the lavas from which the Catoctin greenstone was derived. There the Catoctin Formation lies unconformably on granitic rocks. Its basal sedimentary layer ranges from a few inches to 150 feet in thickness and contains pebbles of underlying basement rocks. The erosion surface beneath the Catoctin is irregular, and in several places, hills as much as 1,000 feet high were buried beneath the Catoctin lavas. No important time break is indicated between the deposition of the Catoctin Formation and the overlying Cambrian sediments. The original Catoctin lavas were basaltic and were probably normal plateau basalts. Columnar joints, amygdules, sedimentary dikes, flow breccias, low-dipping primary joints, and other primary structures are well preserved.
Date: 1969
Creator: Reed, John Calvin, Jr.
Object Type: Report
System: The UNT Digital Library
Pecos National Monument, New Mexico: Its Geologic Setting (open access)

Pecos National Monument, New Mexico: Its Geologic Setting

From introduction: The ruins of the pueblos and missions of Pecos lie on the east bank of Glorieta Creek near its junction with the Pecos River at the south end of the Sangre de Cristo Mountains in north-central New Mexico. Here the Pecos River and Glorieta Creek have formed a broad rolling valley in which the red adobe walls of the mission church stand as a striking monument to a historic past.
Date: 1969
Creator: Johnson, Ross B.
Object Type: Report
System: The UNT Digital Library
Gold Veins Near Great Falls, Maryland (open access)

Gold Veins Near Great Falls, Maryland

From abstract: Small deposits of native gold are present along an anastomosing system of quartz veins and shear zones just east of Great Falls, Montgomery County, Md. The deposits were discovered in 1861 and were worked sporadically until 1951, yielding more than 5,000 ounces of gold. The vein system and the principal veins within it strike a few degrees west of north, at an appreciable angle to foliation and fold axial planes in enclosing rocks of the Wissahickon Formation of late Precambrian (?) age. The veins cut granitic rocks of Devonian or pre-Devonian age and may be as young as Triassic. Further development of the deposits is unlikely under present economic conditions because of their generally low gold content and because much of the vein system lies on park property, but study of the Great Falls vein system may be useful in the search for similar deposits elsewhere in the Appalachian Piedmont.
Date: 1969
Creator: Reed, John Calvin, Jr. & Reed, John Calvin
Object Type: Report
System: The UNT Digital Library
Silurian, Devonian, and Mississippian Formations of the Funeral Mountains in the Ryan Quadrangle, Death Valley Region, California (open access)

Silurian, Devonian, and Mississippian Formations of the Funeral Mountains in the Ryan Quadrangle, Death Valley Region, California

From abstract: A composite section of the Silurian, Devonian, and Mississippian formations in the Funeral Mountains between Death Valley and Amargosa Valley is about 4,700 feet thick. The formations are in the top of a concordant, complexly faulted sequence that is about 25,000 feet thick from the highest part of the Precambrian to the Upper Mississippian. The Silurian and younger formations consist of marine dolomite and limestone that contain some regionally characteristic cherty and siliceous clastic beds as well as widely spaced fossiliferous zones.
Date: 1974
Creator: McAllister, James Franklin
Object Type: Report
System: The UNT Digital Library
Geology and Coal Resources of the Henryetta Mining District, Okmulgee County, Oklahoma (open access)

Geology and Coal Resources of the Henryetta Mining District, Okmulgee County, Oklahoma

From abstract: The mapped area of the Henryetta mining district includes about 168 square miles in Okmulgee County in the east-central part of Oklahoma. The rocks in this district consist of sandstone, silty shale, and shale, and are divided into the Senora formation and the overlying Calvin sandstone of Pennsylvanian age.
Date: 1955
Creator: Dunham, R. J. & Trumbull, J. V. A.
Object Type: Report
System: The UNT Digital Library
Geology of Devils Tower National Monument, Wyoming (open access)

Geology of Devils Tower National Monument, Wyoming

From abstract: Devils Tower is a steep-sided mass of igneous rock that rises above the surrounding hills and the valley of the Belle Fourche River in Crook County, Wyo. It is composed of a crystalline rock, classified as phonolite porphyry, that when fresh is gray but which weathers to green or brown. Vertical joints divide the rock mass into polygonal columns that extend from just above the base to the top of the Tower.
Date: 1956
Creator: Robinson, Charles Sherwood
Object Type: Report
System: The UNT Digital Library
Past Placer-Gold Production from Alaska (open access)

Past Placer-Gold Production from Alaska

"To the end of 1930 Alaska, according to the records of the Geological Survey, had produced placer gold to the value of $258,962,000 from mines widely scattered throughout its length and breadth. The distribution of the placers from which the gold was recovered has been stated in more or less detail in the annual summaries published by the Geological Survey on the mineral industry of Alaska and also in its more complete reports on many of the individual mining districts. Although these summaries and reports have furnished information regarding the larger regions, they have not always given specific details regarding the smaller districts. Furthermore, there has been no recent attempt to assemble and publish in one place the scattered statistics regarding the placer-gold production by years and by regions and districts. The purpose of the present report is to set forth in condensed but comprehensive form a summary of the placer-gold production of Alaska so far as it can be determined from the available official records."
Date: 1933
Creator: Smith, Philip S.
Object Type: Report
System: The UNT Digital Library
The Curry District, Alaska (open access)

The Curry District, Alaska

From abstract: The Curry district lies on the south flank of the Alaska Range, on the southeast side of Mount McKinley. Most of it is west of the Alaska Railroad. The eastern portion can be easily reached from several points along the railroad route, but the western portion is much more difficult of access, owing to the numerous glacial streams and the rugged topography. The relief of the area is great, the elevation ranging from 500 feet along the Chulitna River to 20,300 feet at Mount McKinley. The Chulitna River, a tributary of the Susitna River, drains the larger part of the area described. It flows in a broad valley in the eastern part of the district, and here the maximum relief is about 3,000 feet. The western part of the district is very rugged, with numerous peaks over 6,000 feet in elevation which have sheer slopes and almost unscalable pinnacles. Winding down through this maze of rugged mountains are four major valley glaciers-Eldridge, Buckskin, Ruth, and Tokichitna-and many tributary and smaller glaciers. Practically the entire district, with the exception of the higher peaks and ridges, has been glaciated. Timber grows along the main streams and extends to an elevation …
Date: 1934
Creator: Tuck, Ralph
Object Type: Report
System: The UNT Digital Library
Notes on the Geology of the Alaska Peninsula and the Aleutian Islands (open access)

Notes on the Geology of the Alaska Peninsula and the Aleutian Islands

Abstract: During the spring of 1932 an opportunity was offered by the United States Navy for a geologist to accompany an expedition organized to make a reconnaissance of the western part of Alaska Peninsula and the Aleutian Islands. This expedition visited several localities the geology of which was little known. It was found, as had already been expected, that the islands west of Unimak Pass are composed mainly of basic volcanic lavas and fragmental materials, into which have later been injected dikes, sills, and considerable masses of intrusive rocks, some of which are of acidic types and of granitic texture. These westward islands are bordered both to the north and south by depressions 2,000 fathoms or more in depth, and the islands have apparently been built up from that depth by the ejection and extrusion of volcanic materials since early Tertiary time. No rocks of proved pre-Tertiary age were seen, and the only sedimentary materials present may well have been derived from the erosion of the volcanic islands after they were built up above sea level. On the Alaska Peninsula pre-Tertiary sediments through which the volcanic materials broke to the surface are abundantly present. There is evidence that all the …
Date: 1934
Creator: Capps, Stephen R.
Object Type: Report
System: The UNT Digital Library
Geology of the Santa Rita Mining Area, New Mexico (open access)

Geology of the Santa Rita Mining Area, New Mexico

From abstract: The Santa Rita mining area (pl. 1), covering 35 square miles of semiarid mountainous land, lies within the Silver City 30-minute quadrangle, Grant County, N. Mex., and includes the most productive part of the Central or Hanover mining district. Ore was produced in this district as early as 1804 and production continued intermittently for a century before the developments were undertaken that led to large-scale copper mining, which began in 1912. The output of zinc, lead, and iron increased markedly about the same time.
Date: 1935
Creator: Spencer, Arthur C. & Paige, Sidney
Object Type: Report
System: The UNT Digital Library
Lode Deposits of Eureka and Vicinity, Kantishna District, Alaska (open access)

Lode Deposits of Eureka and Vicinity, Kantishna District, Alaska

From abstract: The Kantishna mining district is about 90 miles west of McKinley Park station on the Alaska Railroad. The part of the district covered by this report comprises an area of about 72 square miles in the form of a strip 6 miles wide and 13 miles long. The bedrock is mainly a metamorphic series of rocks which within the area has been differentiated into a quartz-muscovite schist and a calcareous faces that ranges from limestone to chlorite schist. A few small dikes of quartz porphyry and diabase intrude the schist. The general structure trends N. 700 E., and from an axis that extends from Eldorado Creek northeastward to Spruce Peak the schistosity dips to the northwest and southeast. It is along this axis that the heaviest mineralization has occurred.
Date: 1933
Creator: Wells, Francis G.
Object Type: Report
System: The UNT Digital Library
The Contact Mining District, Nevada (open access)

The Contact Mining District, Nevada

From abstract: This report summarizes the results of a reexamination, in 1930, of the Contact mining district, in Elko County, northern Nevada. A report published as a result of a visit in 1910 summarizes the major features of the geology of the district, and the principal new data in the present paper pertain to mining development occasioned by the completion of a railroad through the camp in 1925.
Date: 1935
Creator: Schrader, Frank C.
Object Type: Report
System: The UNT Digital Library
Coal Geology of the White Oak Quadrangle, Magoffin and Morgan Counties, Kentucky (open access)

Coal Geology of the White Oak Quadrangle, Magoffin and Morgan Counties, Kentucky

From abstract: The White Oak quadrangle lies near the western edge of the eastern Kentucky coalfield and includes approximately 59 square miles of parts of Magoffin and Morgan Counties, Ky. The outcropping rocks are equivalent to most of the Breathitt formation of Pennsylvanian age. The regional southeast dip of the rocks is interrupted by the Irvine-Paint Creek fault, the Caney anticline, the Grape Creek syncline, and the Johnson Creek fault.
Date: 1957
Creator: Adkison, W. L.
Object Type: Report
System: The UNT Digital Library