小嘴贝类腕足动物Planovatirostrum形态奇特，在我国，目前仅在新疆北部和布克赛尔蒙古族自治县和什托洛盖镇北10余公里处七里沟剖面洪......

Recently a rich and well-preserved crinoid community including Traumatocrinus and Encrinus has been found in the Late Tr......