...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Late Cretaceous fish cans: Fish preserved in ammonite body chambers from the middle Santonian of Coahuila State, northeastern Mexico
【24h】

Late Cretaceous fish cans: Fish preserved in ammonite body chambers from the middle Santonian of Coahuila State, northeastern Mexico

机译：晚白垩纪鱼罐头：保存在墨西哥东北部科阿韦拉州中部桑托尼亚人的亚mon体小室中保存的鱼

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Seven partially disarticulated fishes preserved in body chambers of ammonites are described from limestone of middle Santonian (Late Cretaceous) age in northern Coahuila, northeastern Mexico. Three ammonites preserve one fish and one ammonite preserves three fish, all of them in the ammonite's body chamber. In each case, the head is oriented adapically and is close to the last septum of the phragmocone. Seafloor conditions are considered to be hostile; therefore, once the fish entered the ammonite shell, its shelter sunk into oxygen depleted water levels which caused the fish to suffocate and die. Fish are slightly disarticulated with some delicate skeletal elements showing a unidirectional scatter away from the rest of the skeleton towards the ammonite aperture, which can be entirely explained by normal disarticulation due to the early stages of connective tissue breakdown. Due to the nature of fish preservation, it is believed the fish entered the dead ammonite shell to feed or to seek shelter from a predator, whereas other hypotheses are found less likely. The ammonites represent different morphotypes, and each shell preserves a different fish morphotype. The scenarios developed describe thus more general patterns in Cretaceous seas.
机译：在墨西哥东北部Coahuila北部，有中等年龄的白垩纪（白垩纪晚期）石灰岩，描述了7种部分脱节的鱼保存在炸药的体腔中。三只炸药保存了一条鱼，另一只炸药保存了三条鱼，所有这些鱼都在炸药的体内。在每种情况下，头部都具有apapap定向，并靠近睑锥的最后一个隔膜。海底条件被认为是不利的;因此，一旦鱼进入炸药壳，其庇护所就沉入耗尽氧气的水位中，导致鱼窒息而死。鱼与一些细微的骨骼元素略微分开，显示出从骨骼的其余部分向铵孔的单向散射，由于结缔组织分解的早期阶段，正常的分开可以完全解释这一点。由于鱼类保存的性质，据信鱼类进入了死的am石壳中觅食或向捕食者寻求庇护，而发现其他假设的可能性较小。炸药代表不同的形态，每个壳保留着不同的鱼形态。因此，所开发的情景描述了白垩纪海域的更一般模式。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号