PALORBITOLINA LENTICULARIS FROM THE NORTHERN ADRIATIC REGION: PALEOGEOGRAPHICAL AND EVOLUTIONARY IMPLICATIONS
PALORBITOLINA LENTICULARIS FROM THE NORTHERN ADRIATIC REGION: PALEOGEOGRAPHICAL AND EVOLUTIONARY IMPLICATIONS
复制标题
来自北亚得里亚海地区的 PALORBITOLINA LENTICULARIS：古地理和进化意义
DOI：
10.2113/0310287
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Husinec
中科院分区：
文献类型：
--
作者：
A. Husinec
携带Palorbitolina的样本来自亚得里亚海北部Cres岛和Losinj岛的三个地方。虽然研究的标本数量相对较少（<60），但其胚室大小和试验直径表明其Aptian年龄较低。亚得里亚海碳酸盐岩台地的低Aptian指数分类群的存在证实了这一点。胚室和试验直径的变化都是明显的。地层层位与胚室直径的关系未见明显变化。确定了胚胎腔的大小与试验之间的比例关系。
Samples bearing Palorbitolina were obtained from three localities on the islands of Cres and Losinj in the northern Adriatic. Although a relatively small number (<60) of specimens were studied, the size of the embryonic chamber and test diameters of Palorbitolina lenticularis indicate a Lower Aptian age. This is confirmed for the Adriatic carbonate platform by the presence of Lower Aptian index taxa. Both embryonic chamber and test diameter variation are pronounced. No change was observed concerning the relationship between stratigraphic horizon and the embryonic chamber diameter. A proportional relationship between the size of the embryonic chamber and the test was determined.
These data show that before it appeared on the Adriatic carbonate platform, Palorbitolina already colonized the predominantly mixed clastic-carbonate environments of the Mediterranean, as has been suggested by Velic & Sokac (1978). Although an essentially westwards water circulation during the late Barremian and early Aptian probably aided Palorbitolina in colonization of the Tethyan realm, it can neither explain the simultaneous existence of Palorbitolina in different and remote parts of the Tethys nor its dispersal, which must have been very rapid.