The study area is the southwestern peripheral part of the KyoˇSngsang Basin. The maximum thickness of the Nakdong Formation is only 200m thick in this area and gradually thins toward the west. The Sindong Group is relatively coarse-grained here. The Chilgok Formation and the Silla Conglomerate Formation occur in the Changsoˇn Island, but they apparently entail toward the northwest and are no more so divisible in the northern vicinity of Namhae, where they are collectively called here $quot;Namhae Formation.$quot; The angular unconformity between the Yuchsoˇn Group and the low-lying formations is obvious in this area. The Changsoˇn Formation, the basal unit of the Yuchoˇn Group in this area, is composed mainly of andesitic rocks but contains in its upper part the Jijok Member composed of reddish tuffaceous sedimentary layers. Overlying the Changsbn Formation is a unique sedimentary facies of the Yuchoˇn Group. It is here called the Danghangri Formation, of more than 400m thick and composed mainly of pebbly and conglomeratic sandstones. The composition of the pebbles of the Danghangri Formation, i.e., gneiss, quartzite, andesite etc. connotes the dual provenances of the basement rocks and the penecontemporaneous volcanic rocks. The sandstones of the Sindong Group(38 samples) are mainly arkose or arkosic arenite and subordinately subgraywacke and subarkose. A sequential variation of composition is apparent from the Nakdong Formation dominated by subgraywacke to the Jinju Formation dominated by arkose.

A mount consists of two polarizing films at intervals of 2∼3㎜ and a rotatable thin-section holder inserted between two films. The mount is held into a slide projector. We can investigate and study optical characters of rocks and minerals by the projected figures in the same way as the polarizing microscope.

The valuable fossils are distributed in Korean peninsula. In consequence of the development of inland, many road constructions and other public works have been carried out. As a matter of course, lots of paleontological materials in Kyongsang basin were destroyed. Fortunately, one of them was rescued and restored in a suitable place by authors. A fine 4 × 5 m sandstone slab having about 40 dinosaur tracks was brought from Sangchon-ri, Jinju city, and restored at Danghangpo, Goseong County, Gyeongsangnam-do Province. This fossil bearing slab suggests dinosaurs' ecology and paleo-environment during the early Cretaceous Period of Kyongsang basin.