Early Miocene silicified limestone from Temma, northwestern Tasmania: further evidence ofudsubstantial post-Early Miocene uplift or tilting of Tasmania

摘要

Silicified shallow-water Early Miocene (Longfordian) marine limestone occurs in altitudes to over 160m, 12km east of Temma in northwesternudTasmania, the highest elevation known to date for rocks of this age and environment of deposition. Age and environmental dataudare provided by Foraminifera, calcareous algae and poorly preserved macrofauna. Mode of silicification of Foraminifera varies systematicallyudbetween suborders - miliolids and agglutinated species as internal moulds, nodosariids, rotaliids and cibicidids as vohune-for-volumeudreplacements. Foraminifera are benthic only. Miliolids dominate but preservation is too poor to allow statistically valid analysis. The localityudprovides only the second occurrence of Tenisonina tasmaniae Quilty, and, for the first time, it occurs with Sherbornina atkinsoni Chapman.