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弗兰西斯科组中央带混杂堆积的深海灰岩增生块体和其同期的弗兰西斯科地体的古地磁成果的详细分析,说明了将该组灰岩就位到北美科迪勒拉之内的那些大洋板块的相互作用.该组已研究过的所有地层剖面都是在白垩纪正向极性超期期间的沉积,所以沉积作用时的地磁极性已经知晓.各增生块体的方位已由有孔虫生物地层学和沉积岩石学所决定.因为增生块体就位于弗兰西斯科组混杂堆积内的时候,相互之间多半发生旋转;所以每一块体的古地磁倾角需单独计算.由于地磁极性和地层极性二者都已知道,那么,唯一与古水平线有关的磁倾角就限定了地层沉积时的古纬度.古地磁的年龄.可由调试巨型砾岩来确定.
A detailed analysis of the paleomagnetic features of the Franciscan massif in the Franconian Formation with mixed plutons of deep-sea limestone and its corresponding Franciscan terrane at that time illustrates the location of the group of limestones to the North American cordial The interaction of those oceanic plates within the Tazhulam basin, all of the stratigraphic sections studied in this group were deposited during the positive polarity overrun of the Cretaceous, so the geomagnetic polarity of the sediments is known The orientation has been dictated by the foraminiferal biostratigraphy and sedimentary petrology, since most of the accretionary paleo-geliospheric dip for each block is required because the accretionary blocks are located within the mixed deposition of the Francisco group. Calculated separately. Since both geomagnetic polarity and formation polarity are known, the only dip associated with the ancient horizon defines the paleo-latitudes at which the formation was deposited, and the age of the paleomagnetic can be determined by commissioning giant conglomerates.