No. Registros Solicitud 1 5614 colombia

AN - ACCESSION NUMBER: 1957-005710

UD - UPDATE CODE: 1957

Registro 2977 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Investigacion de carbones en Narino y en el Alto Putumayo.

AU - AUTHORS: Gutierrez-R-Hernando

SO - SOURCE: 38-39; Pages 39-48. 1957.

NT - NOTES: Colombia, Div. Nac. Minas, B. Minas ano 4

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: Spanish

AB - ABSTRACT: With the possible exception of the deposit near Condagua, lignitic coals interbedded with lower Tertiary shales and sandstones in Narino and the Putumayo region, Colombia, are not suitable for commercial development. Peat deposits in southern Narino have no value as a source of fuel.

DE - DESCRIPTORS: coal-; Colombia-; Narino--Putumayo-region; organic-residues; sedimentary-rocks; South-America

CC - CATEGORY CODES: 29-Economic-geology-of-energy-sources

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

AN - ACCESSION NUMBER: 1958-002087

UD - UPDATE CODE: 1958

Registro 2978 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Eiszeit und Eiszeitklima in den feuchttropischen Anden.

AU - AUTHORS: Wilhelmy-Herbert

SO - SOURCE: Petermanns Geographische Mitteilungen. Ergaenzungsheft. 262; Pages 281-310. 1957.

PB - PUBLISHER: VEB Hermann Haack Geographische-Kartographische Anstalt. Gotha-Leipzig, Federal Republic of Germany. 1957.

CP - COUNTRY OF PUBLICATION: Federal-Republic-of-Germany

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: German

AB - ABSTRACT: There is evidence of two phases of Pleistocene glaciation in the Andes of the humid tropical zone of Colombia. The direction of prevailing winds and distribution of precipitation were like those of the present. The snow line was lower by 700-1,000 meters and the solifluction zone by 1,350 meters. The mean annual temperature was lower, precipitation was greater, and evaporation and radiation were considerably reduced. These climatic factors account for the glacial phases and played as important a role as glacial meltwater in the origin of the many lakes which occupied high tectonic basins during the Pleistocene.

DE - DESCRIPTORS: Andes-; Cenozoic-; Colombia-; glacial-geology; paleoclimatology-; Pleistocene-; Pleistocene-glaciation; Pleistocene-glaciationclimate; Quaternary-; South-America

CC - CATEGORY CODES: 12-Stratigraphy; 24-Quaternary-geology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus. incl. map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0138-3094

AN - ACCESSION NUMBER: 1958-006311

UD - UPDATE CODE: 1958

Registro 2979 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Zur Erdoelgeologie Suedamerikas insbesondere des Pazifischen Raumes.

AU - AUTHORS: Rassmuss-J-E

SO - SOURCE: Geologische Rundschau. 45; 3, Pages 686-707. 1957.

PB - PUBLISHER: Springer International. Berlin, Federal Republic of Germany. 1957.

CP - COUNTRY OF PUBLICATION: Federal-Republic-of-Germany

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: German

AB - ABSTRACT: Fourteen petroleum provinces are distinguished in South America. The Pacific coast provinces include accumulations in upper Devonian and Gondwana rocks of the sub-Andean zone of Bolivia-northern Argentina, oil fields in the Cretaceous-Tertiary epicontinental basin of the Peru-Ecuador Amazon region, and the Eocene oil fields of the Tertiary shelf region extending from northern Peru to northern Colombia. Data on the stratigraphy and structure of these Pacific provinces are summarized.

DE - DESCRIPTORS: Bolivia-; economic-geology; geology-; Peru-; petroleum-; petroleum-geology; South-America

CC - CATEGORY CODES: 29-Economic-geology-of-energy-sources

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7835

CO - CODEN: GERUA3

AN - ACCESSION NUMBER: 1959-004449

UD - UPDATE CODE: 1959

Registro 2980 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Petroleum geology of the Sinu Basin, Colombia, S.A.

AU - AUTHORS: Oppenheim-Victor

SO - SOURCE: Report of the ... Session - International Geological Congress. Pages 81-90. 1957.

NT - NOTES: 20th, Mexico, [Tr.] sec. 3

PB - PUBLISHER: International Geological Congress. [location varies], International. 1957.

RP - RESEARCH PROGRAM: IGC (International Geological Congress)

CP - COUNTRY OF PUBLICATION: International

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: English

AB - ABSTRACT: The Sinu basin comprises a great thickness (about 20,000 feet) of Cretaceous to Pliocene marine sediments that have been folded into anticlines and frequently are faulted and sometimes overthrust. Numerous oil and gas seeps and mud volcanos suggest substantial accumulations of petroleum, but the possibilities are as yet unexplored.

DE - DESCRIPTORS: Cenozoic-; Colombia-; Cretaceous-; economic-geology; Mesozoic-; petroleum-; possibilities-; Sinu-basin; South-America; Tertiary-

CC - CATEGORY CODES: 29-Economic-geology-of-energy-sources

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus. incl. geol. sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 1023-3210

CO - CODEN: IGCGAO

AN - ACCESSION NUMBER: 1960-003665

UD - UPDATE CODE: 1960

Registro 2981 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Los mamiferos suramericanos; en perspectiva historica.

AU - AUTHORS: Thenius-Erich; Buergl-H

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 10; 39, Pages 123-130. 1957.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1957.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: Spanish

AB - ABSTRACT: Outlines the Tertiary and Quaternary history of mammalian faunas of South America. Crustal movements in the Andean-Central American-Antillean region and climatic changes played an important role in the appearance, migration, development, and extinction of various groups.

DE - DESCRIPTORS: Cenozoic-; Chordata-; Mammalia-; paleontology-; Quaternary-; South-America; Tertiary-; Tertiary-Quaternary-faunas; Tertiary-Quaternary-history; Tetrapoda-; Vertebrata-

CC - CATEGORY CODES: 11-Vertebrate-paleontology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1962-005489

UD - UPDATE CODE: 1962

Registro 2982 de 5614 - GeoRef Disc 1: 1785-1974

BK - BOOK TITLE: Nociones de Prospeccion Geofisica; Tomo I, Metodos Sismico y Magnetico e Introduccion Geologica

Translated Title: Elements of geophysical prospecting; Vol. 1, Seismic and magnetic methods and geologic introduction.

BA - BOOK AUTHORS: Ramirez-Jesus-Emilio; Duran-S-Luis-Guillermo

PB - PUBLISHER: Universidad Nacional de Colombia. Pages: 254. 1957.

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: geophysical-methods; geophysics-; magnetic-methods; seismic-methods; textbooks-

CC - CATEGORY CODES: 20-Applied-geophysics

DT - DOCUMENT TYPE: Book

BL - BIB LEVEL: Monograph

IL - ILLUSTRATION: illus. incl. sketch maps, Bogota.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

AN - ACCESSION NUMBER: 1972-005445

UD - UPDATE CODE: 1972

Registro 2983 de 5614 - GeoRef Disc 1: 1785-1974

BK - BOOK TITLE: Los recursos de rocas, minerales y energia fosil

Translated Title: The rock, mineral and fossil energy resources.

BA - BOOK AUTHORS: Perez-Arbelaez-Enrique

BF - BOOK AUTHOR AFFILIATION: Inst. Geogr. Mil. Comb. "Agustin Codazzo", Bogota, Colombia

CT - COLLECTION TITLE: In the collection: Recursos naturales de Colombia; su genesis, su medida, su aprovechamiento, conservacion y renovacion; Dificultades naturales de Colombia y lucha contra ellas. 1957.

SO - SOURCE: 4; Pages 335-430. 1957.

PB - PUBLISHER: Inst. Geogr. Mil. Colomb. "Agustin Codazzi". Bogota, Colombia. 1957.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1957

LA - LANGUAGE: Spanish

DE - DESCRIPTORS: Colombia-; economic-geology; energy-sources; mineral-resources; production-; reserves-; South-America

CC - CATEGORY CODES: 26A-Economic-geology,-general,-deposits

DT - DOCUMENT TYPE: Book

BL - BIB LEVEL: Monograph

IL - ILLUSTRATION: illus. incl. 46 tables, sketch maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute.

AN - ACCESSION NUMBER: 1991-050960

UD - UPDATE CODE: 1991

Registro 2984 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Situacion geologica de las minas de esmeraldas de Muzo, Boyaca.

AU - AUTHORS: Buergl-Hans

SO - SOURCE: Revista de la Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. 9; 36-37, Pages 381-387. 1956.

PB - PUBLISHER: Academia Colombiana de Ciencias Exactas, Fisicas y Naturales. Bogota, Colombia. 1956.

CP - COUNTRY OF PUBLICATION: Colombia

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: Spanish

LS - LANGUAGE OF SUMMARY: English; German

AB - ABSTRACT: The emerald occurrences of the Muzo district, Colombia, are associated with middle Albian shales in the Cretaceous formations forming the core of a broad anticline, whose eastern margin is bordered by a fault with extensive vertical displacement.

DE - DESCRIPTORS: Boyaca-; Colombia-; Cretaceous-; economic-geology; emerald-; faults-; folds-; gems-; Mesozoic-; Muzo-district; Muzo-emerald-district; ring-silicates; silicates-; South-America

CC - CATEGORY CODES: 26-Economic-geology,-general

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus. incl. geol. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0370-3908

CO - CODEN: RCCFAO

AN - ACCESSION NUMBER: 1956-000863

UD - UPDATE CODE: 1956

Registro 2985 de 5614 - GeoRef Disc 1: 1785-1974

BK - BOOK TITLE: Handbook of South American geology; an explanation of the geologic map of South America.

BA - BOOK AUTHORS: Jenks-William-F (editor)

NT - NOTES: Geol. Soc. Am., Mem. 65

PB - PUBLISHER: Pages: 378. 1956.

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: English

AB - ABSTRACT: A compilation of papers on the geology of various parts of South America prepared as explanatory material for the geologic map published in 1950; includes a preface (by Jenks), a summary of the morphostructural regions of South America (by H. J. Harrington), and papers on the geology of Brazil (by A. I. de Oliveira), French Guiana (by B. Choubert), Surinam (by H. Schols), British Guiana (by S. Bracewell), Paraguay, Uruguay, and Argentina (by Harrington), Bolivia (by F. Ahlfeld), Chile (by J. Munoz Cristi), Peru (by Jenks), Ecuador (by G. E. Lewis, H. J. Tschopp, and J. G. Marks), Colombia (by A. A. Olsson), Venezuela (by V. M. Lopez, H. D. Hedberg, and L. Kehrer), and Trinidad (by H. G. Kugler).

DE - DESCRIPTORS: Geologic-formation-tables; geologic-history; geologic-maps; geology-; handbook-; maps-; South-America; South-America-parts

CC - CATEGORY CODES: 15-Miscellaneous

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Monograph

IL - ILLUSTRATION: illus. incl. geol. maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

AN - ACCESSION NUMBER: 1956-002946

UD - UPDATE CODE: 1956

Registro 2986 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Survival of primitive notoungulates and condylarths into the Miocene of Colombia.

AU - AUTHORS: McKenna-Malcolm-C

SO - SOURCE: American Journal of Science. 254; 12, Pages 736-743. 1956.

PB - PUBLISHER: Kline Geology Laboratory, Yale University. New Haven, CT, United States. 1956.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: English

AB - ABSTRACT: The late Miocene La Venta fauna of the upper Magdalena valley, Colombia, includes remains of a giant condylarth, here described as Megadolodus molariformis n.g. n.sp., and a primitive notoungulate allied to the isotemnids. Both forms represent late survival of early Tertiary mammalian types.

DE - DESCRIPTORS: Cenozoic-; Chordata-; Colombia-; Mammalia-; Miocene-; Miocene-notoungulate-condylarth; Neogene-; Notoungulate-condylarth; paleontology-; South-America; Tertiary-; Tetrapoda-; Vertebrata-

CC - CATEGORY CODES: 11-Vertebrate-paleontology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0002-9599

CO - CODEN: AJSCAP

AN - ACCESSION NUMBER: 1956-004073

UD - UPDATE CODE: 1956

Registro 2987 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Oligocene and lower Miocene biostratigraphy of the Carmen-Zambrano area, Colombia.

AU - AUTHORS: Petters-Victor; Sarmiento-R

SO - SOURCE: Micropaleontology. 2; 1, Pages 7-34. 1956.

PB - PUBLISHER: American Museum of Natural History. New York, NY, United States. 1956.

CP - COUNTRY OF PUBLICATION: United-States

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: English

AB - ABSTRACT: "The Oligocene of the Carmen-Zambrano area is divided into five foraminiferal zones and two subzones, the lower Miocene into two zones; the middle Miocene contains one zonule. A gradual filling-in of the basin is suggested, which was interrupted in the Carmen area by deepening of the sea during the upper lower Oligocene and the middle Oligocene, and at the end of the upper Oligocene. The zones are correlated with faunal units from other parts of the Caribbean area. Ten new species and one new variety are described.".

DE - DESCRIPTORS: Carmen-Zambrano-region; Cenozoic-; Colombia-; Foraminifera-; historical-geology; Invertebrata-; microfossils-; Miocene-; Neogene-; Oligocene-; Oligocene--Miocene; Oligocene-Miocene-foraminifers; Paleogene-; paleontology-; Protista-; South-America; Tertiary-

CC - CATEGORY CODES: 10-Invertebrate-paleontology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus. incl. sketch map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0026-2803

CO - CODEN: MCPLAI

AN - ACCESSION NUMBER: 1956-004756

UD - UPDATE CODE: 1956

Registro 2988 de 5614 - GeoRef Disc 1: 1785-1974

BK - BOOK TITLE: Los minerales radioactivos en Colombia.

BA - BOOK AUTHORS: Ramirez-Jesus-Emilio

SO - SOURCE: Inst. Geofis. Andes Colombianos, s. C (Geol.), B.. 5; 1956.

PB - PUBLISHER: Pages: 24. 1956.

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: Spanish

AB - ABSTRACT: An account of areas of known and potential uranium mineralization in Colombia.

DE - DESCRIPTORS: actinides-; Colombia-; economic-geology; metals-; South-America; uranium-

CC - CATEGORY CODES: 27-Economic-geology-of-ore-deposits

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Monograph

IL - ILLUSTRATION: sk. maps.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

AN - ACCESSION NUMBER: 1956-004967

UD - UPDATE CODE: 1956

Registro 2989 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Bericht ueber lagerstaettenkundliche und geologische Forschungen in Kolumbien.

AU - AUTHORS: Schmidt-Walter-J

SO - SOURCE: Tschermak's Mineralogische und Petrographische Meitteilungen. 5; 4, Pages 407-408. 1956.

NT - NOTES: 3

PB - PUBLISHER: Springer-Verlag. Vienna, Austria. 1956.

CP - COUNTRY OF PUBLICATION: Austria

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: German

AB - ABSTRACT: A brief account of the geology and mineral resources of Colombia. The known ore and gemstone occurrences are associated with ancient crystalline rocks or with products of relatively recent magmatic activity.

DE - DESCRIPTORS: Colombia-; economic-geology; geology-; mineral-resources; South-America

CC - CATEGORY CODES: 26-Economic-geology,-general

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0369-1497

CO - CODEN: MPMTAG

AN - ACCESSION NUMBER: 1956-005439

UD - UPDATE CODE: 1956

Registro 2990 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Interpretacion geologica de los suelos de la region de Chingasa-Farallones-Medina (Cundinamarca).

AU - AUTHORS: Hubach-Enrique

SO - SOURCE: Suelos Ecuatoriales. 1; 1, Pages 31-38. 1956.

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: Spanish

AB - ABSTRACT: The principal features of the six geologic units distinguished in the Chingasa- Medina region, Colombia, are described with reference to the nature of associated soils. The soils associated with Plio-Pleistocene deposits and pre-Carboniferous granites are generally poor, whereas those developed on Oligo-Miocene formations of the piedmont region, Cretaceous formations of the mountainous zone, and Paleozoic formations of the cordilleran foreland vary from poor to good in quality, depending on the composition of the parent rock.

DE - DESCRIPTORS: Chingasa-Medina-region; Colombia-; geologic-history; soils-; South-America

CC - CATEGORY CODES: 25-Soils

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus. incl. g. sk. map.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

AN - ACCESSION NUMBER: 1957-002352

UD - UPDATE CODE: 1957

Registro 2991 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Relieffolgende Ablagerungen vulkanischer Lockermassen.

AU - AUTHORS: Schmidt-Walter-J

SO - SOURCE: Geologische Rundschau. 45; 2, Pages 314-318. 1956.

PB - PUBLISHER: Springer International. Berlin, Federal Republic of Germany. 1956.

CP - COUNTRY OF PUBLICATION: Federal-Republic-of-Germany

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: German

AB - ABSTRACT: As an example of deposits whose primary bedding is not horizontal, describes volcanic tuffs in the vicinity of Nevado del Ruiz, in the central Cordillera of Colombia, which form layers up to several meters in thickness and whose bedding conforms to the relief of the underlying basalt.

DE - DESCRIPTORS: bedding-; Colombia-; Cordillera-; planar-bedding-structures; primary-bedding; sedimentary-structures; sedimentation-; South-America; Tuffs-

CC - CATEGORY CODES: 06-Sedimentary-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0016-7835

CO - CODEN: GERUA3

AN - ACCESSION NUMBER: 1959-004830

UD - UPDATE CODE: 1959

Registro 2992 de 5614 - GeoRef Disc 1: 1785-1974

TI - TITLE: Pseudotectites from Colombia and Peru.

AU - AUTHORS: Martin-R; de-Sitter-Koomans-C

SO - SOURCE: Leidse Geologische Mededelingen. Pages 151-164. 1956.

NT - NOTES: 20 (1955)

PB - PUBLISHER: Ryksmuseum van Geologie en Mineralogie. Leyden, Netherlands. 1956.

CP - COUNTRY OF PUBLICATION: Netherlands

PY - PUBLICATION YEAR: 1956

LA - LANGUAGE: English

AB - ABSTRACT: So-called tektites from Colombia and Peru, for which the name americanite has been used, are mainly obsidian glass. The name macusanite is proposed for this type of pseudotektite, whose chemical composition indicates an intermediate position between sedimentary and igneous rocks. The macusanite specimens contain crystals of sillimanite, zircon, andalusite, mica, and staurolite or cordierite in a glass matrix. They may represent molten sediment solidified as glass or obsidian containing some molten sedimentary material.

DE - DESCRIPTORS: Colombia-; Colombia-Peru; Peru-; petrology-; pseudotektites-; South-America; tektites-

CC - CATEGORY CODES: 05-Igneous-and-metamorphic-petrology

DT - DOCUMENT TYPE: Serial

BL - BIB LEVEL: Analytic

IL - ILLUSTRATION: illus.

RF - REFERENCE SOURCE: GeoRef, Copyright 2000, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States

IS - ISSN: 0075-8639

CO - CODEN: LGMEAX

AN - ACCESSION NUMBER: 1960-003027

UD - UPDATE CODE: 1960

Registro 2993 de 5614 - GeoRef Disc 1: 1785-1974

BK - BOOK TITLE: Sand-shale ratio and isopach maps as aids in determining the depositional environment of the Tertiary formations of the Velasquez Field area, Colombia, South America.

BA - BOOK AUTHORS: Bailey-Henry-H