Geology Commons^™

A Revision Of The Feather Mite Genus Brephosceles (Proctophyllodidae: Alloptinae), Paul C. Peterson

Bulletin of the University of Nebraska State Museum (1924–2023)

A systematic revision is presented for the genus Brephosceles. Data on external morphology, zoogeography, and host-parasite relationships are included. Thirteen named and thirty new species are recognized and described. The new species and the type hosts are: Brephosceles afribycis, from Afribyx lateralis (Charadriidae); B. anhimae, from Anhima cornuta (Anhimidae); B. belonopteri, from Belonopterus chilensis cayennensis (Charadriidae); B. bilobatus, from Puffinus puffinus (Procellariidae); B. chilensis, from Belonopterus chilensis lampronotus (Charadriidae); B. collaracus, from Charadrius collaris (Charadriidae); B. constrictus, from Charadrius bicinctus (Charadriidae); B. diomedei, from Diomedea chrysostoma (Diomedeidae); B. discidicus, from Cygnus bewickii (Anatidae); B. disjunctus, from Pterodroma leucoptera hypoleuca (Procellariidae); …

Petrology And Structure Of Eastern Monte Largo Hills, New Mexico, Jan Ralph Huzarshi

Earth and Planetary Sciences ETDs

In the Monte Largo Hills in the central part of north-central New Mexico, Precambrian metamorphic and igneous rocks, Paleozoic sediments, and Tertiary intrusive and extrusive igneous rocks occur. The metamorphics consist of a series of quartzo-feldspathic gneiss, mica schist, metaquartzite, and hornblende schists. These rocks were

derived from Precambrian sediments, mostly sandstones, arkoses and impure dolomites that were subjected to amphibolite facies synkinematic metamorphism. The Precambrian alkali granite appears to have been allochthonously emplaced with evidence near the contact of the quartzofeldspathic metamorphics for a parautochthonous formation. Quartz veins and pegmatite dikes of Precambrian age are also present. The sediments …

Geologic And Water-Supply Reports And Maps, Nebraska, United States Dept. Of The Interior

Conservation and Survey Division: Faculty and Staff Publications

A list of reports and maps published by the Geological Survey relating to the geology, mineral, water resources of Nebraska.

Groundwater Levels In Nebraska, 1970, C.F. Keech

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Geology Of The Hogback Mountain Area, Northern Big Belt Mountains, Montana., William L. Shaffer

Earth and Planetary Sciences ETDs

The Hogback Mountain area is located in the northern part of the Big Belt Mountains, twenty miles northeast of Helena, Montana.

Sedimentary rocks range in age from Precambrian to Recent, and have an aggregate thickness of about 16, 500 feet. The oldest stratified rocks are two conformable formations of the Precambrian Belt Series; the Newland Formation (oldest) and the Greyson Shale. These rocks have an aggregate thickness of about 10,700 feet.

Rocks of the Belt Series are unconformably overlain by about 1,200 feet of strata of Middle and Late Cambrian age separated into five conformable formation: the Flathead Sandstone (oldest), …

Regressive And Transgressive Phenomena In The Gallup Sandstone In The Northwestern Part Of San Juan County, New Mexico., Francis Amrisar Kaharoeddin

Earth and Planetary Sciences ETDs

The sedimentary history of the Gallup Sandstone is studied through the field investigation and laboratory analysis of samples taken from four measured sections in the vicinity of the San Juan River and one section near the Red Rock Highway. In addition to field data, textural parameters and dolomite and glauconite content of sandstone samples are the basis for interpretations of the sedimentary history and environment of deposition of the Gallup Sandstone.

A plot of the mean grain-size and sorting along with stratigraphic sections reveals that most of the Gallup Sandstone was deposited in a regressive sea, and that the regression …

Structural Geology Of The Oxford Peak Area, Bannock Range, Idaho, Larry C. Raymond

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The mapped area, in southeastern Idaho, includes part of the Bannock Range, on the west, and Cache Valley, on the east. It is centered about 13 miles northwest of Preston, Idaho, and measures 12 miles in the north-south direction and 8.5 miles in the east-west direction.

The Bannock Range, in the western part of the mapped area, consists of Precambrian and Cambrian stratigraphic units. The Precambrian units are as follows: (1) lower Precambrian argillite, (2) Precambrian quartzite, and (3) upper Mutual Formation. The Brigham Formation, which overlies the Mutual, is probably of Cambrian age; however, the lower part may be …

Guidebook To The Geology Along Portions Of The Lower Platte River Valley And Weeping Water Valley Of Eastern Nebraska, R. R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Guidebook To The Late Pliocene And Early Pleistocene Of Nebraska, T. M. Stout, H. M. Degraw, L. G. Tanner, K. O. Stanley, W. J. Wayne, J. B. Swinehart

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

A Generic Revision Of The Pterodedinae, A New Subfamily Of Feather Mites (Sarcoptiformes: Analgoidea), Chong K. Park, Warren T. Atyeo

Bulletin of the University of Nebraska State Museum (1924–2023)

The generic rev1s1on of the Pterodectinae, new subfamily of the Proctophyllodidae, is based on 88 named and over 160 new species. Included are morphology, host-parasite relationships, diagnoses of four named and eight new genera, and illustrations of each type species. The named genera are:

Anisodiscus Gaud and Mouchet, 1957; Montesauria Oudemans, 1905; Proterothrix Gaud, 1968; Pterodectes Robin, 1877. The new genera and their type species are: Dolichodectes, Proctophyllodes (Pterocolus) edwardsi Trouessart, 1885; Megalodectes, Proctophyllodes (Pterodectes) major Trouessart, 1885; Neodectes, Proctophyl/odes (Pterodectes) securiclatus Trouessart and Neumann, 1888; Pedanodectes, Pterodectes hologaster Gaud, 1953; Syntomodectes, Proctophyllodes (Pterodectes) selenurus Trouessart, 1885; Toxerodectes, Pterodectes gladiger …

Use Of Groundwater For Irrigation In Hamilton And York Counties, Nebraska, Eugene K. Steele Jr.

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Pleistocene Aquifers In Coles County, Illinois, James D. Hopkins

Masters Theses

No abstract provided.

Geology Of Mclean County, North Dakota, John P. Bluemle

Theses and Dissertations

McLean County, in west-central North Dakota on the east side of the Williston Basin, is covered by 8,500 to 13,000 feet of Paleozoic, Mesozoic, and Cenozoic rocks, which dip to the west at low angles. The Tertiary Tongue River and Sentinel Butte Formations are widely exposed in McLean County, and the Tertiary Cannonball Formation is exposed in a few places. Glacial drift, assigned to a new formation, the Coleharbor Formation, occurs throughout the county and reaches a maximum thickness of at least 400 feet in certain preglacial valleys.

The eastern part of McLean County, part of the Missouri Coteau, is …

Gastropoda Of The Fox Hills Formation (Maestrichtian) Of North Dakota, J. Mark Erickson

Theses and Dissertations

The Fox Hills Formation (Maestrichtian, Upper Cretaceous) in North Dakota contains a gastropod fauna of thirty-seven species. Five species, Neritina loganensis n. sp., Piestochilus feldmanni n. sp., Hercorhyncus (Hercorhyncus) hollandi n. sp., Remera? cvancarai n. sp., and Cancellaria siouxensis n. sp. , and genus, Dakotia, are newly described. Twenty-four genera in eighteen families representing four orders and two subclasses of Gastropoda are present. Eleven species in a like number of genera are newly reported from the Fox Hills For mation. Goniocylichna bisculpturata and Euspira rectilabrum occur in common with the gastropod fauna of the Ripley Formation of the Mississippi Embayment, …

Erosion And Sedimentation In Lake Ashtabula, Southeastern North Dakota, Darryll T. Pederson

Theses and Dissertations

Erosion along the shore of Lake Ashtabula and nearshore and offshore sedimentation were studied from May 1969 to December 1970. The lake, located in the southeastern part of North Dakota, was formed when the Baldhill Dam stopped the flow of the Sheyenne River in 1950. Maximum depth of the lake is 45 feet in the inundated river channel immediately above the dam. The lake is 27 miles long and ranges in width from 1/3 to 1/2 mile.

Shoreline erosion, measured at stations located at 100-foot intervals around the margins of the lake, was found to be a major source of …

Quantitative Geomorphology And Hydrology Of The Cass River Basin, New Zealand, Frank J. Schulte

Theses and Dissertations

The Cass River drainage basin is in the Southern Alps in the central part of the South Island of New Zealand. The Alps are composed of complexly folded greywacke which is still actively rising. The basin has been modified by several glacial advances during Pleistocene time.

The Cass basin has a temperate climate characterized by a steep precipitation gradient. Its vegetation includes plants of the forest grassland, shrubland, swamp, rock, and river-bed associations.

The Cass basin may be divided into four geomorphic areas: bedrock areas, high-angle fans, moderate-angle fans, and a low-angle fan. The bedrock areas consist of fractured greywacke; …

Hydrothermal Alteration Of Ash-Flow Tuffs In The Indian Peak District Of Southwestern Utah, Michael Allan Tolley

Masters Theses

"Careful petrographic study of the ash-flow tuffs in the Indian Peak District of southwestern Utah reveals hydrothermal alteration around the fluorite veins. The alteration minerals themselves and the intensity of alteration vary with distance from the veins. Primary plagioclase has altered to secondary feldspar, calcite, sericite, and traces of epidote and zoisite. Hornblende and biotite have altered to chlorite, calcite, and secondary iron oxide, and traces of epidote and zoisite. Diopside has changed to calcite and secondary iron oxide. An overall picture of the mining district shows that certain minerals increase and others decrease as one nears the veins. Hydrothermal …

Fossil Otoliths Of Some Lower Cenozoic Perciform Fishes Of The Gulf Coast, Mostafa Juma Salem

Masters Theses

"Nineteen perciform species from the lower Cenozoic and one Recent species are described, and included under eight genera. The main characters that were considered as generic are the outline of the sagitta and the structure of the sulcus. The other features of the otolith were regarded as secondary in importance. The characters that were believed to be valuable at specific level are almost the same as those for the genus but in more detail. These species are considered to be within the Suborder Percoidei. The fossil species of "Nemipterus" were put in the Family Nemipteridae as they resembled the Recent …

Dolomitized Pahasapa Limestone (Mississippian), Northeastern Sector Of The Black Hills, South Dakota, Petrography And Geological Setting, Abdullatif Najjar

Masters Theses

"The carbonates of the Mississippian Pahasapa Limestone in the northeastern sector of the Black Hills outcrops were examined in order to ascertain specific characters of the lithology in this area where the formation is predominantly a dolomite in contrast to adjacent areas where it is mainly a limestone. The Pahasapa seems to be uniform in thickness at the study areas and maintains a thickness of about 550 feet. Because of poor exposures, usually at the base or top, complete sections could not be measured. Much of the Pahasapa consists of coarsely crystalline dolomite containing varying proportions of crinoid plates, gastropods, …

Sediment Properties And Depositional Environment Of The Minnelusa Formation (Permo-Pennsylvanian), Northern Black Hills, South Dakota And Wyoming, El-Magtuf Taleb Taleb

Masters Theses

"Permo-Pennsylvanian sedimentary rocks of the Minnelusa Formation of the Black Hills uplift, South Dakota and Wyoming, can be divided into upper, middle and lower divisions on the basis of lithology. The upper portion of 150 to 200 feet consists of gray and yellow sandstone, with some carbonates and shales in some sections. The middle portion, about 200 to 220 feet thick consists of gray and red sandstone with carbonate members including the prominent dolomite member at the base; some of the carbonates are cherty. The lower portion, 20 to 60 feet thick, consists of pink sandstone, arenaceous dolomite and thin …

Petrology And Petrography Of The Croweburg Coal, North-Central Missouri, William Keith Wedge

Masters Theses

"Under a grant from the National Air Pollution Control Administration, the Missouri Geological Survey undertook a core drilling program of coals in north-central Missouri. The chemical and petrographic characteristics of five complete samples of the Croweburg coal recovered from this drilling project are major contributions of this study. Detailed lithologic logs of the drill cores are an additional contribution of the investigation. Megascopic lithotypes of vitrain, fusain, clarain, and durain as well as areas of mineral matter are described from polished column samples of the Croweburg coal for the first time in Missouri. Measured Croweburg coal sections from five drill …

Distribution Of Trace Elements In Olivines And Proxenes - An Experimental Study, Melvin Leroy Bird

Doctoral Dissertations

"Olivine, pyroxene,and spinel were crystallized in the ternary system anorthite-forsterite-silica to which trace amounts of the transition metal ions Cr³⁺, Fe²⁺, Mn²⁺, Co²⁺, Ni²⁺, and Cu²⁺ had been added. The resulting concentrations of the transition metal ions in the liquid and crystalline phases were determined using the electron microprobe. The results, given as free energies and partition functions, indicate the order of substitution of the dipositive ions in all crystals to be Ni²⁺, Co²⁺, Mn²⁺, Cu²⁺, and Fe²⁺ according to the predictions of crystal field theory. The ion Cr³⁺ substituted in greater or lesser quantities depending on the crystalline phase. …

The Petroleum Geology Of The Midale Subinterval In North Central North Dakota, Kent A. Johnson

Theses and Dissertations

The Mississippian Midale subinterval is the basal unit of the Ratcliffe interval of the Madison Group. The Midale subinterval, an important petroleum producing unit in North Dakota, is a dolomitized limestone which is approximately 40 feet thick. A detailed study of 17 oil fields in north central North Dakota was conducted to determine the petroleum geology of the Midale subinterval. The study was done with the use of 563 mechanical well logs and core samples from 10 wells.

The anhydrite and dolomite units of the Rival subinterval, which underlie the Midale, and the Ratcliffe interval, which over lies the Midale, …

Concretions And Nodules In The Hell Creek Formation, Southwestern North Dakota, Gerald H. Groenwold

Theses and Dissertations

The Hell Creek Formation (Upper Cretaceous) in southwestern North Dakota consists of lagoonal and floodplain deposits and contains abundant concretions and nodules. Representative specimens of the concretions and nodules and their corresponding enclosing sediments were analyzed by thin section and by quantitative and qualitative x-ray diffraction methods.

Fourteen types of concretions and three types of nodules, classified according to shape and composition, have thus been defined. Concretionary types include calcareous sandstone lenses, “logs”, and irregular masses; sideritic sandstone lenses and irregular masses; calcareous and sideritic lignitic sandstone lenses; bone-cored rounded masses; coprolite-cored masses; jarosite bodies; pyrite spheres; baritic sandstone lenses; …

Distribution, Petrology, And Environment Of The St. Louis-Ste. Genevieve Transition Zone In Missouri, Donald Howerton Fielding

Masters Theses

"In eastern Missouri, southeastern Iowa, and western Illinois - a transition zone, a body of rock consisting of several lithosomes which has a geographic extent measured in scores to hundreds of miles and which lies between a single overlying formation and a single underlying formation and which has lithologic and/or paleontologic properties common to both the overlying and the underlying formations, was found to exist between the St. Louis and the Ste. Genevieve formations. This transition zone is called the St. Louis-Ste. Genevieve Transition Zone, and is shown to possibly be due to continuous deposition between these two times and …

Ground Water Of The Uncompahgre Valley Montrose County, Colorado, Ted William Craig

Masters Theses

"Data from water quality tests of 50 wells and from general well information of 309 wells registered with the Colorado Division of Water Resources are presented for the area of Montrose County, Colorado, drained by the Uncompahgre River. This information, along with other pertinent information such as water laws and costs, is evaluated to determine the feasibility of increasing the use of ground water in the area. The drainage basin of the Uncompahgre River within the Montrose area bas three main geologic structures: the Uncompahgre uplift, the Montrose syncline, and the Gunnison uplift. All formations exposed in the area are …

Freshwater Losses To The Sea And Water Level Decline In Northwest Libya, Mohammed Ahmed Attiga

Masters Theses

"The area studied in this investigation, located in Tripolitania, Libya, between 13º and 16º east longitude and 31º and 33º north latitude, covers about 42,000 square kilometers. It is divided topographically into two parts. They are the coastal zone to the north and the Jebel (plateau) zone to the south. Some wadis which rise in the Jebel drain northward across the area to the sea. The temperature in the area ranges from 5ºC to 19ºC in the winter and from 19ºC to 40ºC in the summer. Precipitation in the area ranges from 380 millimeters to less than 100 millimeters. The …

Directory Of Nebraska Quarries, Pits, And Mines, R. R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Dunes On The Plains, The Sand Hills Region Of Nebraska, C. F. Keech, R. Bentall

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Shaded Topographic Map Of Nebraska

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.