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我国早二叠系沉积有海相和陆相,沉积面积占全国总面积的81%。未接受沉积的古陆和古岛仅占19％,其中海相沉积占80％,平均厚度约600米;陆相占20％,平均厚度约300米,沉积岩总体积约400—450万立方公里。海相地层中发育着大量的生物群,在碳酸盐岩为主的地区生物含量40％以上的地层占41％,最高的可达84.8%,基本上是含生物灰岩。生物种类繁多.有:珊瑚、腕足类、苔藓虫、有孔虫、棘皮类、斧足类、头足类、三叶虫、介形类、海绵、鱼类以及大量的各种藻类。在陆相地层中含大量的植物,有各种羊齿、轮木、芦木等化石群。动植物的大量存
Early Permian sediments in our country have marine and continental facies, accounting for 81% of the total area of the country. Unconsolidated ancient land and ancient islands accounted for only 19%, of which marine deposits accounted for 80% of the average thickness of about 600 meters; land accounted for 20% of the average thickness of about 300 meters, the total volume of sedimentary rock about 400-450 million cubic kilometers. In the marine strata, a large number of biota are developed. In carbonate-dominated regions, the strata that contain more than 40% of the total bio-content account for 41% and the highest is 84.8%, basically containing biogenic limestone. There are a wide variety of species: coral, brachiopods, bryozoans, foraminifera, echinoderms, axipods, cephalopods, trilobites, mesoids, sponges, fish and a wide range of algae. In the continental strata containing a large number of plants, there are a variety of ferns, round wood, wood and other fossils. Mass storage of animals and plants