I am geologist from Russia, and now looking for information about pseudomorphs after ikaite, so-called glendonites or gennoi-shi. Their records are well-known from Cenozoic rocks of Japan, Sakhaline and Kamchatka, but the oldest record of these pseudomorphs from this region to my knowledge has been mentioned only once in the following paper:
Otsuki, Journ. Geol. Soc. Japan, 1901, v.VIII, p.327
Fortunately this paper is available online, see
CiNii Articles - Journal of the Geological Society of Japan 8(94) - Table of Contents
I am know only name of pseudomorphs used herein - ‘Hokoseki’ (it could be erroneous transliteration as it made from Russian, because I have found this information in a little-known Russian article).
Could you help me and post here info (if it is present in the discussed paper) about age of these records (Triassic, Jurassic or Cretaceous?) and locality where they were found?
Thanks in advance