6 ART. 8. H. YABE. 



calated seams of a coaly shale as above stated. In thickness, it 

 is far inferior to the remaining uj^per portion of the Kyöng-syang 

 formation. Its peculiarity consists in the easy destructibility of 

 its shales and sandstones by atomospheric agencies ; the hills in 

 the region of these rocks are usually very low and undulating, 

 except where capped with a thick conglomerate bed when they 

 are high and steep. The scarcity of vegetation and the low 

 mound like hills give the landscape a peculiar aspect. The 

 upper portion of the Kyöng-syang formation is generally com- 

 posed of harder rocks, aloso with frequent intercalations of con- 

 glomerate and breccia, especially near the top. The topography 

 of the region is tolerably distinct from that described above ; it 

 consists of mountains or hills of higher elevations and where 

 the water courses have cut into these rocks, perpendicular 

 bluffs are presented which afford excellent opportunities for the 

 study of the order of rock layers, and for searching for fossils, 

 although few of the latter have been obtained and those only 

 from the lower series in a very bad state of preservation. 

 Ripple-marks have frequently been met with in the rocks of the 

 upper series. 



A greater regularity prevails in the arrangement of the rock- 

 layers of the Kyöng-syang formation. They seem not to have 

 suffered from any great subsequent disturbances except by the 

 faulting of the Korean and Hansan systems, therefore they retain 

 nearly their orginal horizontal position, dipping very slightly 

 to the east (strictly speaking, the dip varies locally from NE. 

 to SE.). 



The collection of fossils to the description of which this 

 paper is solely devoted, was made on a slope of a hill named 

 Pul-tang-kokai, on the way from Söul to Fusan, and at about 



