Formational divisions of Difunta Group, Parras Basin, Coahuila and Nuevo Leon, Mexico
Formational divisions of Difunta Group, Parras Basin, Coahuila and Nuevo Leon, Mexico
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迪芬塔群、帕拉斯盆地、科阿韦拉州和新莱昂州、墨西哥的地层划分
DOI：
10.1306/bc743829-16be-11d7-8645000102c1865d
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发表时间：
1962
期刊：
影响因子：
3.5
通讯作者：
P. Lewis
中科院分区：
文献类型：
--
作者：
G. Murray;A. E. Weidie;D. R. Boyd;R. Forde;P. Lewis
墨西哥科阿韦拉州南部和新莱昂西部帕拉斯盆地的Difunta群由两个主要的互舌岩相组成，复合厚度约为4,000米。三个灰色、棕色、红色和绿色、部分杂色的细粒至粗粒钙质砂岩、粉砂岩和泥岩单元在萨尔蒂略-塞佩达将军地区的南部最厚;它们在萨尔蒂略-帕雷登-希波利托铁路附近向北和向东楔出。红色单元之间有四个互层单元，黑色、灰色、棕色和绿色钙质页岩和粉砂岩以及灰色至棕色砂岩和页岩。在萨尔蒂洛-帕雷登-伊波利托铁路以东，它们构成了一个尚未分化的序列。各种红色和灰棕色的单位已被映射到萨尔蒂略附近向西和向北分别约100英里和50英里的距离，在一个相对复杂的结构区域。因此，它们是可制图的岩性单位，因此在本文中被定义为地层，并按降序命名为：兰乔努埃沃、拉斯恩西纳斯（红层）、大山、拉斯伊马杰尼（红层）、卡农德尔图勒、韦尔塔山（红层）和普韦布洛山地层。各种地层的模式产地位于沿着或邻近从萨尔蒂略通往西南偏南和西北偏北的主要道路。
The Difunta Group of the Parras Basin, southern Coahuila and western Nuevo Leon, Mexico, consists of two major intertonguing lithic facies with a composite thickness of approximately 4,000 meters. Three gray, brown, red, and green, partly variegated, fine- to coarse-grained calcareous sandstone, siltstone, and mudstone units are thickest on the south in the Saltillo-General Cepeda area; they wedge out north and east in the vicinity of the Saltillo-Paredon-Hipolito railroad. Four units of interbedded, black, gray, brown, and green calcareous shales and siltstones and gray to brown sandstones and shales occur between the red units. East of the Saltillo-Paredon-Hipolito railroad they compose an as yet undifferentiated sequence. The various red and gray-brown units have been mapped westward and northward from the vicinity of Saltillo for distances of approximately 100 and 50 miles, respectively, in a region of relatively complex structure. They are, therefore, mappable lithic units and are thus defined as formations in this paper, being named in descending order: Rancho Nuevo, Las Encinas (redbeds), Cerro Grande, Las lmagenes (redbeds), Canon del Tule, Cerro Huerta (redbeds), and Cerro del Pueblo Formations. Type localities for the various formations are located along or adjacent to major roads leading south-southwest and north-northwest from Saltillo.