Paleontological Analysis on Late Paleozoic Era in Central Andes. Report on Field Work in 1990.

In succession of our biostratigraphic study of the Paleozoic and Mesozoic Groups in Central Andes, which was started in 1980, more detailed field survey and re-examinination were undertaken during late July to late August, 1990.The present article is a preliminary report on the field survey of the Tarma Group (Middle Carboniferous) developed near Tarma City in Peru and the Copacabana Group (Upper Carboniferous to Lower Permian) developed near and around Titicaca Lake in Bolivia.The journeys in these two countries are shown in Figures 1 and 2.The aims of the present research are mainly as follows : 1) To be completed our biostratigraphic study of the Upper Paleozoic (Carboniferous-Permian) in Central Andes with the conodonts as additional data, and 2) To make clear the boundary between the Carboniferous and Permian Systems in the Copacabana Group.In Peru, the rock samples for conodont analysis were collected from the Tarma Group which consists mainly of dark gray limestone of ca.70 m thick.The lower half of the limestone is more or less massive but the upper one intercalates slate and shale beds.In the field work,