a. 古生代的
n. 古生代
n. 古生代
- The stratigraphic column in this district includes all the paleozoic formations
这个地区的地层柱包括全部古生代岩系。收藏 - Some organisms have persisted with so little change that specimens living today are quite similar to their Paleozoic or mesozoic ancestors
有些生物一直很少变化,以至生存至今的生物与它们古生代或中生代的祖先仍十分相象。收藏 - The Middle Paleozoic
中古生代的收藏 - The following examples of oil and gas fields in distributary and delta-fringe sand bodies range in age from Late Paleozoic to Middle Cenozoic
下面所列举的是分布于分流和三角洲前绿砂体的油气田的例子,在地质时代上从晚古生代至中新生代。收藏 - A Paleozoic microfossil usually having a toothlike shape and considered to be the remains of an extinct marine organism.
牙形刺一种古生代微化石,一般有牙状形体,被认为是一种已灭绝海生生物体的残骸收藏
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