graptolites信息详情
笔石类
graptolite───[古生]笔石动物；[古生]笔石
graptolitic───笔石的
datolites───n.硅灰硼石；硅钙硼石
granulites───n.[岩]麻粒岩；粒变岩
saprolites───n.残余土；[地质]腐泥土
scapolites───n.[矿物]方柱石
troctolites───n.橄长石；[岩]橄长岩
cryptozoites───潜隐体
aerolites───n.[地质]陨石；石陨石
Between one edge of the three-foot-thick gray band and the other, some 80 percent of marine species died out, many of them the sorts of creatures, like graptolites, that no longer exist.───约1米厚的灰色岩石带子的各个带层之间，约80%的海洋物种灭绝了，其中许多是生物物种，象笔石动物，再也不会在这个世界上存在了。
During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.───在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。
The graptolites are generally preserved as films in mudstones or muddy siltstones at the depths of thousands meters beneath the surface.───这些笔石标本一般保存成薄膜状于数千米之下的泥岩或泥质粉砂岩之中。
Material illustrating detailed structure of graptolites has been etched from limestone by means of hydrofluoric acid.───表明笔石详细构造的物质是利用氢氟酸从石灰岩中侵蚀出来。
Lower Silurian graptolites from southern Anhui───安徽南部下志留统笔石
On this argument the graptolites should have been bottom dwelling-colonial organisms, living by filtering small particles of food from the water.
Several of these graptolites are preserved on the flat bedding surfaces of a black shale.
Material illustrating detailed structure of graptolites has been etched from limestone by means of hydrofluoric acid.