以下为句子列表：
英文: According to observation and study, the paleokarstifications of Ordovician could be classified into 6 periods, i.e. depositional karstification, weathering curst karstification, burial karstification, semi-burial structural karstification, second burial k
中文: 研究表明，皖北奥陶系古岩溶可划分为沉积岩溶作用期、风化壳岩溶作用期、埋藏岩溶作用期、构造岩溶作用期和二次埋藏岩溶作用期；其岩溶类型主要有沉积岩溶、风化壳岩溶、埋藏岩溶或压释水岩溶和构造岩溶或热水岩溶四种类型；其岩溶岩包括岩溶沉积岩和岩溶改造岩两个大类，并可进一步划分出8个亚类和5个子亚类。
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英文: From the Cambrian to the early Middle Ordovician, the Cambrian radiolaria and the Early Ordovician conodonts of the Erlangping trough in the northern part of EQM, and the Cambrian trilobites and Early Ordovician conodonts as well as cephalopods of the nor
中文: 在寒武纪至中奥陶世早期，东秦岭北部二郎坪海槽的寒武纪放射虫和早奥陶世牙形石与东秦岭南部浙川陆棚北部的寒武纪三叶虫、早奥陶世牙形石和头足类属华南生物省，而浙川陆棚南部的寒武纪三叶虫和早奥陶世牙形石属于华南生物省，兼有华北生物省分子。
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英文: In the Late Ordovician, the lithofacies palaeogeography framework of two troughs alternating with three platformsin the Early, Middle and Late Cambrian and the Early and Middle Ordovician was changed.
中文: 在中国晚奥陶世，早、中、晚寒武世和早、中奥陶世一直存在的“两槽和三台相间分布”的岩相古地理基本格局已经改变，天山北山蒙辽吉槽地中的北山槽地和蒙辽吉槽地已不再是槽地而变成了台地。
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英文: In view of the petroleum geologic conditions and exploration degree of Ordovician in Tahe oilfield, three different methods such as pool size sequence, resources area abundance and geologic factor regression are selected for prediction/estimation of its p
中文: 摘要针对塔河油田奥陶系石油地质条件和勘探程度，选用了油藏规模序列法、资源面积丰度法和地质因素回归法等三种不同方法，从不同的角度对奥陶系石油资源潜力进行估算。
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英文: Now it is thought that two formations were formed in the same period from Early Cambrian to Early Ordovician and were deposited in different parts of sea basin on the northern edge of the North China Platform, based on the acritarchs contained in these fo
中文: 通过对以上两个组中疑源类化石进行研究，认为阿牙登组应从白云鄂博群中分出，与腮林忽洞组一同划归早寒武世至早奥陶世的地层中，阿牙登组与腮林忽洞组为同一时期不同局限海盆的沉积，是早古生代华北地台最北部边缘的沉积产物。
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