摘要：The Up per Oxfordian mi cro bial-sponge ag glu ti nated to open-frame reef com plex of the Zegarowe Crags in the Kraków–Czêstochowa Up land orig i nated upon an el e va tion of the Late Ju ras sic sta ble north ern shelf of the Tethys. This el e va tion was formed, ow ing to a lo cal de crease in sub si dence rate dur ing Ju ras sic time, in du?ced by the pres ence of a Palaeozoic granitoid in tru sion in the shelf sub stra tum, and Late Ju ras sic, synsedimentary tec ton ics, which con trolled the to pog ra phy of the sea bot tom. The Zegarowe Crags (Ska³y Zegarowe) com plex at the top con tains mi cro bial laminites, com posed of peloidal and ag glu ti nated stromatolites, and in ter ca la tions of grainstones with in de ter min able, favrenoid cop ro lites, oc cur ring in large num bers. The de vel op ment of stromato?lites was as so ci ated with low nu tri ent avail abil ity. In con trast, the pe ri odic ac tiv ity of crabs, the main pro duc ers of the cop ro lites, form ing the coprolitic grainstone in ter ca la tions, in di cates pe ri ods, when nu tri ents were abun dant in the sea wa ter. The nutrinets most likely were as so ci ated with the oc cur rence of clouds of suspended mat ter, in duced by grav ity flows, gen er ated by ac tive, synsedimentary tec ton ics. The results of iso to pic stud ies do not sup port the pres ence of warm, min er al iz ing so lu tions, con nected with synsedimentary tec ton ics dur ing de vel op - ment of the Zegarowe Crags com plex in the Late Ju ras sic.
