Late Carboniferous (probably Moscovian) ammonoids and associated
 corals were recovered from limestone blocks in a Jurassie acrcretionary
 complex of the Kuzumaki-Kamalshi Sub-belt of the North Kitakami
 Belt, within the drainage basin of the Mabechigawa River, south of
 Ichinohe, Northern Kitakami Massif, Northeast Japan.  The limestone
 blocks are associated with basalts of oceanic island origin; together,
 these rocks probably constitute a seamount-reef complex.  The
 ammonoids, which are the first Paleozoic ammonoids and the first reli-
 able Carboniferous fossils to be deseribed from the North Kitakami
 Belt, indieate that the oceanie plate assoeiated with forrnation of the
 accretionary complex in the Kuzumaki-Kantaishi Sub-belt had already
 formed by the Late Carboniferous.