Cavity-dwelling biota in Middle Ordovician (Chazy) bryozoan mounds from Quebec
Cavity-dwelling biota in Middle Ordovician (Chazy) bryozoan mounds from Quebec
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DOI：
10.1139/e81-004
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发表时间：
1981
影响因子：
1.4
通讯作者：
D. R. Kobluk
中科院分区：
文献类型：
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作者：
D. R. Kobluk
由魁北克蒙特利尔附近查日群(中奥陶世早期)拉瓦尔组的Batostoma chazyens组成的苔藓虫丘含有骨架洞穴，其中容纳了腔体离子(洞穴栖息)生物群。关于奥陶纪腔叶虫的报道很少见，这是首次报道Chazy群中含有腔叶虫的土丘。藻类、海绵和苔藓虫(蝙蝠口纲)在洞穴生物群中占主导地位，并被发现覆盖洞壁和屋顶。这些藻类以哺乳动物结壳(现在的泥晶藻)和Solenpora sp.为代表。在屋顶上。海绵未被鉴定，但既以孤立的单轴、三轴和六射线针状体出现，也以腔体化石的形式出现。还发现了亲和力未知的球状细胞。这些洞穴提供了腔体生物侵蚀的第一个证据。锥虫是唯一的大型钻孔虫，存在于洞壁中；石器内(钻孔)藻类的存在，表明早在中奥陶世白垩纪就已发现。
Bryozoan mounds, dominated by Batostoma chazyensis from the Laval formation of the Chazy Group (early Middle Ordovician) near Montreal, Quebec contain framework cavities that house a coelobiontic (cavity-dwelling) biota. Reports of coelobionts of Ordovician age are rare, and this is the first report of Chazy Group mounds containing coelobionts.Algae, sponges, and bryozoa (Batostoma) dominate the cavity biota, and are found encrusting cavity walls and roofs. The algae are represented by mammillary encrustations (now micrite), and Solenpora sp. on the roofs. The sponges are not identified, but occur both as isolated monaxial, triaxial, and six-rayed spicules, and as body fossils within the cavities. Coccoid cells, of unknown affinities, are also found. These cavities provide the first evidence of coelobiontic biological erosion. Trypanites, a compound morphogenus, is the only macroborer and is found in cavity walls; endolithic (boring) algae are present, and indicate that as early as the Middle Ordovician b...