No. Registros Solicitud 1 5614 colombia

DE - DESCRIPTORS: Albian-; Ammonites-; Ammonoidea-; assemblages-; biostratigraphy-; biozones-; Bivalvia-; Caballos-Formation; carbonate-rocks; Cephalopoda-; Chordata-; Colombia-; correlation-; Cretaceous-; Foraminifera-; Huila-Colombia; Invertebrata-; limestone-; Lower-Cretaceous; Magdalena-Valley; Mesozoic-; Mexico-; microfossils-; Mollusca-; paleoclimatology-; paleoenvironment-; paleogeography-; Pisces-; planktonic-taxa; Protista-; sea-level-changes; sedimentary-rocks; South-America; Tethys-; Tetrabranchiata-; Tetuan-Limestone; Texas-; United-States; Vertebrata-

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-081098

UD - UPDATE CODE: 200423

Registro 18 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Modernization of South American freshwater fishes and their habitats.

AU - AUTHORS: Lundberg-John-G

AF - AUTHOR AFFILIATION: Academy of Natural Sciences, Icthyology, Philadelphia, PA, United States

BK - BOOK TITLE: In: Geological Society of America, 2003 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 35; 6, Pages 58. 2003.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: Geological Society of America, 2003 annual meeting. Seattle, WA, United States. Nov. 2-5, 2003.

LA - LANGUAGE: English

AB - ABSTRACT: Direct fossil evidence shows that by the middle Miocene (ca. 15 Ma) the South American freshwater fish fauna was essentially modern across wide taxonomic and ecological ranges. There is a growing number of Cenozoic records of living fish clades including river sting rays, lungfishes, osteoglossids, a great variety characins and catfishes, electric eels, cichlids and percichthyids. Late Cretaceous fossils provide the earliest direct indications of a few extant groups. However, placing these fossils into their phylogenetic and global biogeographic contexts indicates a much deeper time frame in the Mesozoic for origins of some Neotropical groups. Overall then, it is clear that late Miocene though Holocene Earth history events and biotic factors played little or no role in creating the great diversity of Neotropical fishes at the levels of family, genus and species group. Fish diversification is no doubt ongoing, but since the Miocene this has been at low taxonomic levels. During the Cretaceous and earliest Cenozoic several "archaic" fishes completely disappeared from South America. In contrast, the fossil record contains few documented extinctions of distinct lines of fishes that are phylogenetically close to living Neotropical groups. There are, however, many cases of late and post-Miocene regional extirpation of modern groups from areas peripheral to the large, lowland tropical rivers. Local extinctions are related to tectonic isolation of faunas in small watersheds and probably climatic change. The distributions of both modern and fossil Neotropical fishes are consistent with geological and biological evidence for landform change that altered or created the courses and some aquatic habitats of the major drainage systems such as the Amazon, Parana, Orinoco, Magdalena and Maracaibo.

DE - DESCRIPTORS: Amazon-River; Argentina-; biologic-evolution; Brazil-; Cenozoic-; Chordata-; cladistics-; Colombia-; Cretaceous-; drainage-basins; extinction-; fresh-water-environment; geomorphology-; habitat-; Lake-Maracaibo; Magdalena-River; Mesozoic-; Orinoco-River; paleoecology-; paleoenvironment-; Parana-River; phylogeny-; Pisces-; South-America; species-diversity; tropical-environment; Venezuela-; Vertebrata-

CC - CATEGORY CODES: 11-Vertebrate-paleontology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-080932

UD - UPDATE CODE: 200423

Registro 19 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Cenozoic Andean geochronology, paleoenvironments and tectonic history; evidence from South American fossil mammals.

AU - AUTHORS: Flynn-John-J

AF - AUTHOR AFFILIATION: Field Museum of Natural History, Geology, Chicag, Il, United States

BK - BOOK TITLE: In: Geological Society of America, 2003 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 35; 6, Pages 58. 2003.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: Geological Society of America, 2003 annual meeting. Seattle, WA, United States. Nov. 2-5, 2003.

LA - LANGUAGE: English

AB - ABSTRACT: Mammals provide key data for understanding evolution, documenting faunal change through time, and assessing environmental transformations. For >100 years, knowledge of South American fossil mammals has been derived almost exclusively from the remarkable, but incomplete and sparsely-calibrated record from Patagonia and other lowland, high-latitude sites. Broader availability of data from the tropics and montane regions permits development of a precise terrestrial geochronology, integrating magnetostratigraphy, radioisotopic calibration, and biochronology (South American Land Mammal "Ages", SALMAs). Exceptionally diverse or important Tertiary mammal faunas from the Andes are now known from Chile, Bolivia, Colombia, and Ecuador, helping to "fill in the picture" of evolution on a more continental scale. This paper reviews geochronologic advances, and environmental and tectonic inferences derived from Chilean Andean faunas. Key among these are >12 new assemblages from the central Chilean Abanico Formation (spanning approximately 4 degrees of latitude and >25 m.y., from the Eocene to mid-Miocene). Fossils are so ubiquitous that this unit now represents a premiere archive of SA mammal evolution, shedding light on periods of environmental restructuring, diversification pulses for "archaic" endemic lineages, and initial diversification of autochthonous clades (e.g., caviomorph rodents, platyrrhine primates). The first-discovered of these assemblages represents a recently named SALMA (Tinguirirican), and documents the earliest appearance of open-habitat/grassland environments ( approximately 15-20 m.y. earlier in SA than elsewhere), possibly related to major climate changes near the Eo/Oligo boundary. Perhaps the best-sampled temporal interval is the early-mid Miocene ( approximately 20-11 Ma), with important Andean assemblages (complementing the classical record from lowland Argentina) now known from S. Chile (47 degrees S) to Colombia (3 degrees N). Intervening sequences occur throughout central Chile, the Chilean and Bolivian Altiplano, and Ecuador. This interval now appears to represent a time of pervasive orogenesis and rapid uplift throughout much of the Andes, undoubtedly with major biotic ramifications (reflecting environmental change, increased topographic complexity, and geographic isolation creating endemism).

DE - DESCRIPTORS: Andes-; Argentina-; biostratigraphy-; Cenozoic-; Chile-; Chordata-; chronostratigraphy-; ecosystems-; Ecuador-; Eocene-; Eutheria-; geomorphology-; habitat-; Mammalia-; Miocene-; Neogene-; paleoecology-; paleoenvironment-; Paleogene-; Patagonia-; Primates-; Rodentia-; South-America; tectonics-; Tertiary-; Tetrapoda-; Theria-; uplifts-; Vertebrata-

CC - CATEGORY CODES: 12-Stratigraphy

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-080931

UD - UPDATE CODE: 200423

Registro 20 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Maastrichtian to early Miocene patterns of plant diversification in the neotropics.

AU - AUTHORS: Jaramillo-Carlos-A

AF - AUTHOR AFFILIATION: Instituto Colombiano del Petroeo, Biostratigraphy, Bucaramanga, Colombia

BK - BOOK TITLE: In: Geological Society of America, 2003 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 35; 6, Pages 58. 2003.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: Geological Society of America, 2003 annual meeting. Seattle, WA, United States. Nov. 2-5, 2003.

LA - LANGUAGE: English

AB - ABSTRACT: The Neotropics holds one the highest plant diversities in the world. How this large biodiversity was produced is still uncertain. Many processes and mechanisms that could produce a high biodiversity in the tropics have been proposed in the last decade. In contrast, the patterns of diversification of Neotropical floras through geological time have been little studied. These patterns could be used to test the processes and mechanisms proposed. Here, we studied the pollen and spore diversity record of Colombia and Western Venezuela from the Maastrichtian to the Early Miocene. Thirty-two sections (including outcrops and wells), 4800 samples, and more than 960,000 individual records of pollen and spores were analyzed. Several techniques, including range-through method, detrended correspondence analysis, and Shannon index were used to assess the significance of the observed diversity pattern. The record shows a moderately diverse flora dominated by angiosperms, ferns and gymnosperms during the Maastrichtian, followed by a diversity crisis at the Cretaceous-Tertiary boundary. Paleocene floras have a low diversity and are dominated by angiosperms. Diversity significantly increases at the early to middle Eocene reaching levels similar to modern Neotropical lowland humid forests. This increase in the diversification engine could be related to the Eocene thermal maximum. The extinction rate increases by the end of the Eocene. During the Oligocene and early Miocene there is a period of low background origination and extinction never again reaching the levels seen in the Eocene. The overall pattern shows that plant diversity in the Neotropics is subject to historical accidents that produced discrete pulses of origination and extinction rather than a constant high rate of origination or low rate of extinction. Processes that explain the high diversity in the tropics must take into account this fact.

DE - DESCRIPTORS: biostratigraphy-; Cenozoic-; Cretaceous-; K-T-boundary; lower-Miocene; lower-Paleocene; Maestrichtian-; Mesozoic-; microfossils-; Miocene-; miospores-; Neogene-; Paleocene-; paleoecology-; paleoenvironment-; Paleogene-; palynomorphs-; Plantae-; pollen-; Senonian-; South-America; species-diversity; spores-; stratigraphic-boundary; Tertiary-; tropical-environment; Upper-Cretaceous; Venezuela-

CC - CATEGORY CODES: 12-Stratigraphy; 09-Paleobotany

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-080930

UD - UPDATE CODE: 200423

Registro 21 de 5614 - GeoRef : 2002-2004/12

BK - BOOK TITLE: Rock physics and 3-D seismic characterization of reservoir heterogeneities to improve recovery efficiency.

BA - BOOK AUTHORS: Gutierrez-Mario-Augusto

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2001

DG - DEGREE GRANTED: Doctoral

DI - DEGREE GRANTING INSTITUTION: Stanford University. Stanford, CA, United States. Pages: 153. 2001.

LA - LANGUAGE: English

DE - DESCRIPTORS: acoustical-methods; anticlines-; body-waves; Cenozoic-; clastic-rocks; Colombia-; cores-; diagenesis-; displacements-; elastic-waves; faults-; folds-; geophysical-methods; heterogeneity-; impedance-; La-Cira-Infantas-Field; mineral-composition; normal-faults; oil-and-gas-fields; P-waves; patterns-; petroleum-; porosity-; pressure-; recovery-; reservoir-properties; reservoir-rocks; reverse-faults; S-waves; sandstone-; sedimentary-rocks; seismic-methods; seismic-waves; South-America; Tertiary-; three-dimensional-models; thrust-faults; velocity-; well-logs

CC - CATEGORY CODES: 29A-Economic-geology,-geology-of-energy-sources; 16-Structural-geology

DT - DOCUMENT TYPE: Thesis-or-Dissertation

BL - BIB LEVEL: Monograph

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute.

IB - ISBN: 0-493-38254-2

AV - AVAILABILITY: University Microfilms, Ann Arbor, MI, United States

AN - ACCESSION NUMBER: 2004-077951

UD - UPDATE CODE: 200422

Registro 22 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Divergence of late Miocene Caribbean and eastern Pacific tropical benthic Foraminifera; evidence from Ecuador and Caribbean Panama.

AU - AUTHORS: Schultz-Susan; Collins-Laurel-S; Berggren-William-A; Aubry-Marie-Pierre

AF - AUTHOR AFFILIATION: Florida International University, Department of Earth Sciences, Miami, FL, United States

BK - BOOK TITLE: In: Geological Society of America, 2002 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 34; 6, Pages 315. 2002.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2002.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2002

CN - CONFERENCE INFORMATION: Geological Society of America, 2002 annual meeting. Denver, CO, United States. Oct. 27-30, 2002.

LA - LANGUAGE: English

AB - ABSTRACT: In the Paleogene to earliest Neogene, foraminiferal and molluscan faunas from the Caribbean and Eastern Pacific were reported as quite similar. Four million years ago the tropical seaway that connected the two oceans closed completely, and today the two faunas are different in composition. We compare the benthic foraminiferal faunas of two formations from either side of the Central American isthmus that are from the same time interval, planktic foraminiferal Zone N17 (8.3-5.6 Ma), and the same general bathymetry, middle neritic. The Rio Indio facies of the Chagres Formation, which crops out near the Caribbean entrance to the Panama Canal, is middle neritic. Benthic foraminiferal assemblages are dominantly Atlantic in affinity or cosmopolitan, and include few taxa that are or were primarily Pacific. The Angostura Formation, NW coast of Ecuador, includes middle neritic and shallow outer neritic facies exposed along the Rio Santiago and Punta Verde, respectively. Unlike most of the Miocene neritic sediments of Panama and Colombia, these were well oxygenated and contained diverse faunas, allowing direct comparison with those of the Caribbean. The deeper assemblage of benthic foraminifera contains more endemic species (e.g., Epistominella sandiegoensis, Hanzawaia evansi) than does the shallower assemblage, but many of the species were still transisthmian in the Late Miocene. The species distributions indicate a stage of developing endemism in Late Miocene, Eastern Pacific faunas. The deeper, outer neritic faunas of the Angostura Formation show greater divergence with the Caribbean than shallower, middle neritic faunas. Deeper faunas should have been affected first by the rise of the sill that severed the connection between tropical Atlantic and Eastern Pacific faunas.

DE - DESCRIPTORS: Angostura-Formation; assemblages-; Atlantic-Ocean; benthonic-taxa; Caribbean-region; Caribbean-Sea; Cenozoic-; Central-America; Chagres-Formation; coastal-environment; Colombia-; East-Pacific; Ecuador-; endemic-taxa; Epistominella-sandiegoensis; faunal-studies; Foraminifera-; Hanzawaia-evansi; Invertebrata-; microfossils-; Miocene-; Mollusca-; Neogene-; North-Atlantic; outcrops-; Pacific-Ocean; Panama-; Panama-Canal-Zone; Protista-; Punta-Verde; Rio-Santiago; shallow-water-environment; South-America; species-diversity; subtidal-environment; Tertiary-; tropical-environment; upper-Miocene

CC - CATEGORY CODES: 12-Stratigraphy; 10-Invertebrate-paleontology

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-077501

UD - UPDATE CODE: 200422

Registro 23 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: Can sulfur in lacustrine sediments be used as a proxy for rainfall?.

AU - AUTHORS: Mora-German; Hinnov-Linda

AF - AUTHOR AFFILIATION: Iowa State University, Department of Geological and Atmospheric Sciences, Ames, IA, United States

BK - BOOK TITLE: In: Geological Society of America, 2002 annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 34; 6, Pages 313. 2002.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2002.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2002

CN - CONFERENCE INFORMATION: Geological Society of America, 2002 annual meeting. Denver, CO, United States. Oct. 27-30, 2002.

LA - LANGUAGE: English

AB - ABSTRACT: Although water balance in terrestrial settings is an important climate parameter, relatively few proxies are available for reconstructing effective moisture. Here, we investigate the possibility of using sulfur speciation as a proxy for paleo-rainfall in sediments recovered from a large paleo-lake in the Bogota Basin, Colombia and spanning the last 600,000 years. Samples were digested with a mild acidic solution to extract acid-soluble sulfur minerals. Sulfur species extracted through this procedure included monosulfides, whereas sulfur in the remaining acid-insoluble fraction was found to be bound to organo-sulfur compounds. Monosulfide/total sulfur ratios range from 0.2 to 0.9 in the studied sediments and exhibit a cyclic distribution with depth. Low (<0.4) monosulfide/total sulfur ratios are characteristic of glacial intervals, whereas interglacial intervals exhibit both low and high ratios. Because partitioning of sulfur between monosulfides and organo-sulfur compounds depends on iron availability, we interpret that elevated iron delivery to the paleo-lake occurs at relatively high precipitation rates and results in the sequestration of sulfur in monosulfide minerals. Conversely, incorporation of sulfur into organic matter occurs at low precipitation rates when iron supply is low. Time-series analysis of sulfur ratios reveals the influence of orbital parameters (i.e., obliquity and precession). Given that rainfall in the tropics is primarily associated with the passage of the Inter-tropical Convergence Zone (ITCZ), we conclude that obliquity and precession exert a significant control on the intensity or zonality of the ITCZ that ultimately affects rainfall patterns in the Colombian Andes.

DE - DESCRIPTORS: Andes-; Bogota-Basin; Cenozoic-; Colombia-; isotope-fractionation; isotope-ratios; isotopes-; lacustrine-environment; lake-sediments; obliquity-of-the-ecliptic; organic-sulfur; paleoclimatology-; paleohydrology-; partitioning-; precession-; precipitation-; Quaternary-; S-34-S-32; sediments-; South-America; stable-isotopes; statistical-analysis; sulfur-; time-series-analysis; water-balance; zoning-

CC - CATEGORY CODES: 24-Quaternary-geology; 02D-Isotope-geochemistry

DT - DOCUMENT TYPE: Abstract; Serial; Conference-Document

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7592

CO - CODEN: GAAPBC

AN - ACCESSION NUMBER: 2004-077489

UD - UPDATE CODE: 200422

Registro 24 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: El genero Siphogenerinoides en el Cretacico superior del valle superior del Magdalena, Colombia

Translated Title: The Siphogenerinoides genus in the Upper Cretaceous of the high valley of Magdalena, Colombia.

AU - AUTHORS: Gonzalez-J-O; Martinez-J-I

AF - AUTHOR AFFILIATION: Inst. Colombiano Petrol., Bucaramanga, Colombia

SO - SOURCE: Revista Espanola de Micropaleontologia. 29; 3, Pages 300-322. 1997.

PB - PUBLISHER: Empresa Nacional. Madrid, Spain. 1997.

CP - COUNTRY OF PUBLICATION: Spain

PY - PUBLICATION YEAR: 1997

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English

DE - DESCRIPTORS: benthonic-taxa; Buliminacea-; Campanian-; Colombia-; Cretaceous-; Foraminifera-; functional-morphology; Invertebrata-; La-Tabla-Formation; Maestrichtian-; Magdalena-Valley; Mesozoic-; microfossils-; morphology-; morphometry-; Olini-Group; Protista-; revision-; Rotaliina-; Santonian-; Senonian-; Siphogenerinoides-; South-America; taxonomy-; Upper-Cretaceous

CC - CATEGORY CODES: 10-Invertebrate-paleontology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: Refs: 31; 2 tables, 3 plates.

RF - REFERENCE SOURCE: GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Instituto Geologico y Minero de Espana, Madrid, Spain

IS - ISSN: 0556-655X

CO - CODEN: RTEMB5

AN - ACCESSION NUMBER: 2004-077141

UD - UPDATE CODE: 200422

Registro 25 de 5614 - GeoRef : 2002-2004/12

TI - TITLE: The offshore Guajira, Colombia; lessons for the Scotian margin?.

AU - AUTHORS: Wach-Grant-Douglas; Shaughnessy-Dan

AF - AUTHOR AFFILIATION: Dalhousie University, Department of Earth Sciences, Halifax, NS, Canada

BK - BOOK TITLE: In: Geological Society of America, Northeastern Section, 38th annual meeting.

BA - BOOK AUTHORS: Anonymous

SO - SOURCE: Abstracts with Programs - Geological Society of America. 35; 3, Pages 23. 2003.

PB - PUBLISHER: Geological Society of America (GSA). Boulder, CO, United States. 2003.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 2003

CN - CONFERENCE INFORMATION: Geological Society of America, Northeastern Section, 38th annual meeting. Halifax, NS, Canada. March 27-29, 2003.

LA - LANGUAGE: English

AB - ABSTRACT: The offshore Guajira, Colombia is a prolific gas province (over 7 tcf identified) with the Ballena and Chuchupa fields in production for over 25 years. The petroleum system and structural history are complex. Recent exploration activity has moved from the developed carbonate platforms on the shelf to look at plays on the deepwater slope and basin floor. These plays comprise complex structural and stratigraphic traps associated with slope fan and basin floor fan deposition. The key in determining the reservoir potential associated with these plays is the identification of the sediment conduits that can supply reservoir quality sediments to these fans. Additional play concepts take the form of carbonate reef and platform build-ups. What lessons can we apply from the offshore Guajira to current exploration activity along the Scotian margin?.