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一、地层区划原则根据第一届全国地层会议《关于中国地层区划的建议》一文中所提出的各级地层区划的原则(以下简称“建议”),结合陕西的具体情况,基本上遵循下列原则进行地层区划。(一)一级地层区(地层区)的划分原则主要考虑古生代沉积建造,包括三叠纪海相地层的总体特征。在“地台”区一级地层区内,“系”以上的地层单位岩相可以对比,“统”基本可以对比或分区对比。“地槽”区划的着眼点是主回返期,回返期是四个转折点的标志:1.沉积的转折点(由“地槽”型
I. Principles of Stratigraphic Division According to the principle of stratigraphic division at all levels (hereinafter referred to as the “Proposal”) proposed in the article “Suggestions on the Stratigraphic Division of China” of the First National Stratigraphic Conference, in combination with the specific conditions in Shaanxi, the following principles are basically followed Stratigraphic division. (I) The principle of the division of the first-level stratigraphic zone (stratigraphic zone) mainly considers the sedimentary construction of the Paleozoic, including the general characteristics of the Triassic marine strata. In the “platform” area of a stratigraphic zone, “strata” strata above the facies can be compared lithofacies, “system” can be compared to the basic or regional contrast. The focus of the “Trench” zoning is the main return period, which is a sign of four turning points: 1. The turning point of the deposition (represented by the “trough” type