cretaceous

No creditable macrofossil record of the Fagaceae exists in the Cretaceous deposits and all the Cretaceous microfossil reports remain equivocal and require further study.

白垩纪尚无壳斗科可靠的大化石记录，微化石需要一步研究才能缘关系以及古新世壳斗科已经化出两个类群。

(2) the Cretaceous pelite unit had undergone progressively increasing degrees of partial melting with the proximity of the Goat Ranch granodiorite;

②变泥质岩发生了熔融，表现为离羊圈花岗闪长岩岩体的距离越远，熔融程度越低；

The study shows that Cretaceous volcanics mainly consist of medium acidic volcanic lava and volcanoclastic rocks, with locally developed basic lava;

结果认为，白垩纪火山岩以中酸性火山熔岩和火山碎屑岩为主，局发育基性熔岩；

Abstract :The Cretaceous greenhouse climate and paleoceanography is one of hot topics in the Earth sciences during the past twenty years.

提要： 白垩纪典型的“温室”气候和海洋一直是地学界关注的焦点之一。

Its basement is mainly composed of Paleozoic epimetamorphic rocks and the cover mostly consists of Cretaceous graywacke and organic shale formation,as well as Cenozoic loose elastic accumulations.

笔者通过对前人资料析研究后认为：松辽盆地具有良好的成矿地质条件和找矿前景；

In both cases, the researchers have evoked scenarios of Cretaceous vicariance, followed by endemic species radiation within Madagascar and subsequent dispersal from Madagascar to other areas.

这些情形，研究人员已经考虑了白垩纪的隔离，接着特有种在马达加斯加听散布及随后从马达加斯加扩散到其中地区域。

The paleo -geotemperature that Carboniferous went through at geologic history could not be too high and commonly was under120℃.The highest geotemperature occurred at late Cretaceous when la...

结合盆地地质情况,石炭系在地质历史上经历的古地温不会太高,一般没有超过120℃,所经历的最高地温时间是晚白垩世,大量有机质在这一时期行生排烃,具有晚期成烃的特点。

The basin tectonic model: it is intermont basin during late Jurassic to early Cretaceous, developed into faulted-lacustrine basin in Eogene, and evolved into depression in Neogene and Quaternary.

“盆地”构造发育模式为：从晚侏罗世到白垩纪末期发育的山间“盆地”开始、发展到早第三纪断陷湖盆的发育、再演化为晚第三纪及第四纪地陷发育阶段。