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塔里木盆地东部碳酸盐岩型罗西台地西缘内斜坡带的罗西1井钻遇中奥陶统达瑞威尔阶一间房组—大坪阶鹰山组灰岩。330m厚的一间房组中—下部取芯段见藻丘建造,群落结构以隐藻为主,由隐藻纹层和藻团粒、藻凝块和藻屑纹层交替组成,结晶孔洞构造发育,指示偏深水的低能带沉积,其中的少量动物骨屑如介形类、三叶虫、腕足类和床板珊瑚等可能来自其东边的台地浅水相生屑滩。一间房组近顶部演变为海退型砂屑滩序列。
The Rossi-1 well in the west margin of the western carbonate margin of the Rossi platform in the Tarim Basin has encountered a limestone in the Middle Ordovician Darriverian-Ifangfang Formation-Daping JiaoYingShan Formation. 330m-thick room in a group of middle-lower coring section to see the algae building, community structure to mainly algae algae, algae layer by the albumen pattern and algae, algae clot and algae layer alternately composed of crystal pore structure development, Indicating low-lying sediments of partial deep water, among which a small amount of animal bones, such as mesoids, trilobites, brachiopods and bed corals, may come from the shallow platform of shallow-boulders in the east. Nearly the top of a house group evolved into a reef-shaped sandy littoral sequence.