アンデス中部地域の古・中生界の生物層序学的研究 (2) : 昭和57年度現地調査報告

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In succession to the field work in 1980, we engaged in the biostratigraphic field survey in the Andean region. The journeys in Peru and Bolivia are shown in Fig. 1. In Peru, we had the field surveys to the Tarma and Cajamarca areas. In the Tarma area, two routes along slopes at Umancacha and Tucuhuajanan were selected for measuring the “Upper Triassic” Chambara Formation (lower part of the Pucara Group). Rock samples for conodont analysis were collected at intervals of about 10 m. The Pennsylvanian Tarma Group developed in the vicinity of Tarma City, which consists mainly of limestone, was also measured and many fusulines (Fusulinella etc.), corals, bryozoans, brachiopods and so on were collected. In the Cajamarca area, a large Cretaceous fauna comprising molluscs and echinoids were collected in the valley of Hd. Otuzco, northeastern part of Cajamarca. In Bolivia, the Copacabana Group (Lower Permian) developed on a small hill, Cerro Jacha Khatawi near Yaurichambi was studied in detail. We made the geological map of the hill at an original scale of 1 : 5, 000 (Fig. 2) and also made the columnar sections along three routes. Abundant fossils such as fusulines, bryozoans, brachiopods and molluscs were collected there. The fossils of the Copacabana Group in Yampupata and Chirapaca in the Copacabana area (Fig. 3) were also collected. Paleontological studies of them will be made by Japanese partakers. Some problems are discussed for our future field work; 1) method of field work, 2) co-operation with the Geological Surveys : INGEMMET in Peru and GEOBOL in Bolivia, and 3) the political situations.
社団法人東京地学協会の論文

アンデス中部地域の古・中生界の生物層序学的研究 (2) : 昭和57年度現地調査報告

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