113 



in another place.^) To give the detailed geognostic accounts of these 

 is, however, foreign to the scope of the present paper.^) 



(f) The Lower Sambagawan. 



The Lower Sambagawnn series crops out only in few localities 

 along the banks of rivers and rivulets ; the greater part of it is covered 

 by the Middle division, and consequently hidden from our view. 



It is, however, not ver^^ difficult to ascertain its occurrence 

 through having among its members a characteristic purple-red pied- 

 montite-schist which affords us the surest criterion as to the boun- 

 dary of the Lower and Middle Sambagawan. 



1. — A good exposure, not to mention minor occurrences, may 

 be seen along the winding course of the Tsuki-gawa on a small, 

 isolated island of schists amidst the younger geologic formations, to 

 the east of the village of Ogawa, especially in Töyama, Simo-sato, 

 and Kamakata, all in the district of Hiki, Miisasi province. Here 

 the strata lie almost horizontal with slight dips to the north and east. 

 It is, indeed, very striking to behold the contrast in colour between 

 the overlying chlorite-amphibolite rich in felspar-" eyes" and the 

 purple-red piedmontite-schist. The rosy mangan-epidote, so rare 

 in Europe and America, and much sought after by mineralogists, 

 occurs in rich clusters within quartz-nodules, sometimes attaining 

 2 centim. or more in length. Lower down we see in thick banks the 

 whitish-gray normal sericite-schist which through weathering acquires 

 a somewhat green colour, while a greenish-yellow pistacite becomes 



1) This journal, Vol. I, part I ; "A Note on Glaucophane." 



2) Prof. Geo. H. Williams, of the Johns Hopkins University, Baltimore, Mtl., has lately 

 sent me a chip of a g-laucophane-schist from the State of California. Of the Glaucophane of 

 that State, we have as yet only a few records in petrogra.phioal literature. Miehcl-Livy 

 seems to have been the first t-o <?ive a short descripHon of it ("4th Annual Report of the 

 State mineralogist of California." p. 182, ISS-i, — a work which is not accessible to the writer.). 

 F. Becker has mentioned its wide distribution in the Cretaceous metamorphics of that State. 

 (See American Journal of Science, p. 352, 1S8C). 



On examining a slide prepared from a specimen from Berkley, California, the writer was 

 quite surprised at finding a groat similarity between the glaucophanc-schist of the Kitagawa 

 pass, Tosa (See tliis journal. Vol. I, p. 02.) an<l that of the Pacific Coast, U. S. ; but our schist 

 is of the ? pre-Carboniferous age instead of being of the Cretaceous. The writer cannot here 

 pass over in the silence the great obligation he is under to Prof. Williams for his gift of a most 

 valuable collection of the typical glaucophanes of Europe, for which he can scarcely find any 

 adequate words to express his deep sense of gratitude. 



