Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
When Landsat TM images of the Eastern Slick Hills of Oklahoma were manipulated using standard pro... more When Landsat TM images of the Eastern Slick Hills of Oklahoma were manipulated using standard processing techniques, the result was a banding pattern which appeared to correspond to the mapped lithologic units. The primary objective of this study was to determine whether vegetation, lithology, or soils produced the spectral reflectances recorded by Landsat TM. Using ERDAS and a twenty-four bit color display, standard band combinations, ratios, and principle component analyses were performed on a Landsat TM image of the study area. Further, a geographic information system (GIS), was utilized to determine any relationships between the processed image, and published lithologic and soil maps. A spectrometer was used to obtain spectral reflectance curves for the soil, vegetation, and rock surfaces collected along a transect of the Eastern Slick Hills. The set of spectral curves obtained for each resource type was then compared to the spectral readings that were acquired by the Landsat TM sensor. From this, it was determined that the rock outcrops caused the spectral patterns that occurred on the processed imagery.
Hydrocarbon producing structures such as salt domes, serpentine plugs, drape folds, and growth fa... more Hydrocarbon producing structures such as salt domes, serpentine plugs, drape folds, and growth faults exist throughout a large area of south Texas. Surface expressions of known oil producing fields associated with these subsurface features were analyzed with multisensor remote sensing data for anomalous drainage patterns, surface lineations, and geobotanical hydrocarbon alteration. Space Shuttle color imagery and radar data were analyzed and downloaded over the Internet from NASA`s Earth Observation Laboratory at the Johnson Space Center in Houston Texas. The Internet access saved considerable time in researching the archives for image selection. Selected Shuttle Imagery were processed and enhanced for analysis and comparison to Landsat MSS, TM and radar data taken over the exploration study areas. Examples are presented to illustrate the comparisons made among the different sensor types.
Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
ABSTRACT The main objective of this study was to determine the presence of dolomite within lithol... more ABSTRACT The main objective of this study was to determine the presence of dolomite within lithologic sequences of the Arbuckle Group in the Slick Hills, using Landsat TM data. Samples from six formations of the Arbuckle Group were collected and spectral curves made using a spectral radiometer in labs. These spectral curves were then compared with each band of Landsat TM in search of dolomite spectral patterns. Using ERDAS, GRASS and MultiSpec image processing and GIS software, multiband combinations, ratios and principle components computer processing was performed and analyzed. The result was a Landsat derived image that differentiates dolomite from limestone in the Slick Hills.
Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
The Rosillos Mountains consist of a large, highly faulted and fracture, exposed Tertiary igneous ... more The Rosillos Mountains consist of a large, highly faulted and fracture, exposed Tertiary igneous intrusion (laccolith) located adjacent to Big Bend National Park. This study examines the alluvial deposits that fan out over the 25,000 acre privately owned Rosillos Ranch located on the east side of the laccolith. Using a field spectrometer, spectral curves were generated for the various materials
The architecture of the jaw muscles and their tendons of Alligator mississippiensis is described ... more The architecture of the jaw muscles and their tendons of Alligator mississippiensis is described and their function examined by electromyography. Alligator grabs its prey with forward lunges or rapid lateral movements of the head. It does not engage in regular masticatory cycles. Prey is manipulated by inertial movements and the tongue does not appear to play any role in transport. The Mm. adductor mandibulae externus, adductor mandibulae posterior, and pterygoideus activate bilaterally and simultaneously during rapid closing or crushing. The M. pterygoideus does not act during prey holding whereas the Mm. adductor mandibulae externus, adductor mandibulae posterior continue to be active. The Mm. depressor mandibulae and intramandibularis are variably active during both jaw opening and closing.
ABSTRACT Sebecus huilensis, an advanced sebecosuchian crocodilian, was first described by Langsto... more ABSTRACT Sebecus huilensis, an advanced sebecosuchian crocodilian, was first described by Langston (1965) based on a fragmentary lower jaw from the Miocene La Venta Formation of Colombia. New skeletal fragments from the same unit are referable to S. cf. huilensis and add to our knowledge of sebecosuchian cranial and postcranial anatomy. These fragments indicate that the skull was more laterally compressed than that of the Eocene S. icaeorhinus (based on comparison with the type of the latter). S. cf. huilensis is the first sebecosuchian for which a complete retroarticular process is known. The posterior portion of the retroarticular process is unlike that of any known crocodilian, with a ventral deflection of the medial edge, indicating significant changes in muscle size. A single, unusual osteoscute also may be referred to this animal, suggesting that sebecosuchians had some dermal osteoscutes. Comparison with the type of S. huilensis also suggests that Buffetaut and Hoffstetter (1977) may have been in error in assigning a Miocene Peruvian sebecosuchian to this species.
A number of methods and products, both hardware and software, to allow data exchange between Appl... more A number of methods and products, both hardware and software, to allow data exchange between Apple Macintosh computers and MS-DOS based systems. These included serial null modem connections, MS-DOS hardware and/or software emulation, MS-DOS disk-reading hardware and networking.
Seismic Processing Workshop, a program by Parallel Geosciences of Austin, TX, is discussed in thi... more Seismic Processing Workshop, a program by Parallel Geosciences of Austin, TX, is discussed in this column. The program is a high-speed, interactive seismic processing and computer analysis system for the Apple Macintosh II family of computers. Also reviewed in this column are three products from Wilkerson Associates of Champaign, IL. SubSide is an interactive program for basin subsidence analysis; MacFault
This column briefly reviews several geologic software packaged designed for Apple Macintosh. In a... more This column briefly reviews several geologic software packaged designed for Apple Macintosh. In addition, it discusses methods of networking Apple Macintosh computers.
In this issue's column, the author discusses a variety of geologically related software pack... more In this issue's column, the author discusses a variety of geologically related software packaged. Included among them are the Postscript-based drafting program, Illustrator 88; a French/English program that integrates data base management tools, and graphics allowing one to design maps called MacGeoS II;a software package for interactive modeling and interpretation of magnetotelluric and controlled source audio-frequency magnetotelluric data; and Terra Mobilis, a program for generating a variety of plate tectonic reconstructions of continent positions.
Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
When Landsat TM images of the Eastern Slick Hills of Oklahoma were manipulated using standard pro... more When Landsat TM images of the Eastern Slick Hills of Oklahoma were manipulated using standard processing techniques, the result was a banding pattern which appeared to correspond to the mapped lithologic units. The primary objective of this study was to determine whether vegetation, lithology, or soils produced the spectral reflectances recorded by Landsat TM. Using ERDAS and a twenty-four bit color display, standard band combinations, ratios, and principle component analyses were performed on a Landsat TM image of the study area. Further, a geographic information system (GIS), was utilized to determine any relationships between the processed image, and published lithologic and soil maps. A spectrometer was used to obtain spectral reflectance curves for the soil, vegetation, and rock surfaces collected along a transect of the Eastern Slick Hills. The set of spectral curves obtained for each resource type was then compared to the spectral readings that were acquired by the Landsat TM sensor. From this, it was determined that the rock outcrops caused the spectral patterns that occurred on the processed imagery.
Hydrocarbon producing structures such as salt domes, serpentine plugs, drape folds, and growth fa... more Hydrocarbon producing structures such as salt domes, serpentine plugs, drape folds, and growth faults exist throughout a large area of south Texas. Surface expressions of known oil producing fields associated with these subsurface features were analyzed with multisensor remote sensing data for anomalous drainage patterns, surface lineations, and geobotanical hydrocarbon alteration. Space Shuttle color imagery and radar data were analyzed and downloaded over the Internet from NASA`s Earth Observation Laboratory at the Johnson Space Center in Houston Texas. The Internet access saved considerable time in researching the archives for image selection. Selected Shuttle Imagery were processed and enhanced for analysis and comparison to Landsat MSS, TM and radar data taken over the exploration study areas. Examples are presented to illustrate the comparisons made among the different sensor types.
Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
ABSTRACT The main objective of this study was to determine the presence of dolomite within lithol... more ABSTRACT The main objective of this study was to determine the presence of dolomite within lithologic sequences of the Arbuckle Group in the Slick Hills, using Landsat TM data. Samples from six formations of the Arbuckle Group were collected and spectral curves made using a spectral radiometer in labs. These spectral curves were then compared with each band of Landsat TM in search of dolomite spectral patterns. Using ERDAS, GRASS and MultiSpec image processing and GIS software, multiband combinations, ratios and principle components computer processing was performed and analyzed. The result was a Landsat derived image that differentiates dolomite from limestone in the Slick Hills.
Geological Society of America, Abstracts with Programs; (United States), Feb 1, 1993
The Rosillos Mountains consist of a large, highly faulted and fracture, exposed Tertiary igneous ... more The Rosillos Mountains consist of a large, highly faulted and fracture, exposed Tertiary igneous intrusion (laccolith) located adjacent to Big Bend National Park. This study examines the alluvial deposits that fan out over the 25,000 acre privately owned Rosillos Ranch located on the east side of the laccolith. Using a field spectrometer, spectral curves were generated for the various materials
The architecture of the jaw muscles and their tendons of Alligator mississippiensis is described ... more The architecture of the jaw muscles and their tendons of Alligator mississippiensis is described and their function examined by electromyography. Alligator grabs its prey with forward lunges or rapid lateral movements of the head. It does not engage in regular masticatory cycles. Prey is manipulated by inertial movements and the tongue does not appear to play any role in transport. The Mm. adductor mandibulae externus, adductor mandibulae posterior, and pterygoideus activate bilaterally and simultaneously during rapid closing or crushing. The M. pterygoideus does not act during prey holding whereas the Mm. adductor mandibulae externus, adductor mandibulae posterior continue to be active. The Mm. depressor mandibulae and intramandibularis are variably active during both jaw opening and closing.
ABSTRACT Sebecus huilensis, an advanced sebecosuchian crocodilian, was first described by Langsto... more ABSTRACT Sebecus huilensis, an advanced sebecosuchian crocodilian, was first described by Langston (1965) based on a fragmentary lower jaw from the Miocene La Venta Formation of Colombia. New skeletal fragments from the same unit are referable to S. cf. huilensis and add to our knowledge of sebecosuchian cranial and postcranial anatomy. These fragments indicate that the skull was more laterally compressed than that of the Eocene S. icaeorhinus (based on comparison with the type of the latter). S. cf. huilensis is the first sebecosuchian for which a complete retroarticular process is known. The posterior portion of the retroarticular process is unlike that of any known crocodilian, with a ventral deflection of the medial edge, indicating significant changes in muscle size. A single, unusual osteoscute also may be referred to this animal, suggesting that sebecosuchians had some dermal osteoscutes. Comparison with the type of S. huilensis also suggests that Buffetaut and Hoffstetter (1977) may have been in error in assigning a Miocene Peruvian sebecosuchian to this species.
A number of methods and products, both hardware and software, to allow data exchange between Appl... more A number of methods and products, both hardware and software, to allow data exchange between Apple Macintosh computers and MS-DOS based systems. These included serial null modem connections, MS-DOS hardware and/or software emulation, MS-DOS disk-reading hardware and networking.
Seismic Processing Workshop, a program by Parallel Geosciences of Austin, TX, is discussed in thi... more Seismic Processing Workshop, a program by Parallel Geosciences of Austin, TX, is discussed in this column. The program is a high-speed, interactive seismic processing and computer analysis system for the Apple Macintosh II family of computers. Also reviewed in this column are three products from Wilkerson Associates of Champaign, IL. SubSide is an interactive program for basin subsidence analysis; MacFault
This column briefly reviews several geologic software packaged designed for Apple Macintosh. In a... more This column briefly reviews several geologic software packaged designed for Apple Macintosh. In addition, it discusses methods of networking Apple Macintosh computers.
In this issue's column, the author discusses a variety of geologically related software pack... more In this issue's column, the author discusses a variety of geologically related software packaged. Included among them are the Postscript-based drafting program, Illustrator 88; a French/English program that integrates data base management tools, and graphics allowing one to design maps called MacGeoS II;a software package for interactive modeling and interpretation of magnetotelluric and controlled source audio-frequency magnetotelluric data; and Terra Mobilis, a program for generating a variety of plate tectonic reconstructions of continent positions.
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