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A Potential Candidate For the Middle‐Upper Cambrian Boundary Stratotype — An Introduction to the Paibi Section in Huayuan, Hunan
Author(s) -
Xiping Dong
Publication year - 1990
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1990.mp3003007.x
Subject(s) - stratotype , trilobite , conodont , paleontology , geology , global boundary stratotype section and point , section (typography) , boundary (topology) , carbonate platform , biostratigraphy , ordovician , facies , stage (stratigraphy) , structural basin , mathematical analysis , mathematics , advertising , business
The Middle‐Upper Cambrian boundary is one of the current stratigraphical problems which remain open in the geological world, since there have been no universally acknowledged delimiting standard and stratotype. Acting on the instruction of Profs. Lu Yanhao and An Taixiang the author studied in details the Paibi Section, which is well exposed as a continuous sequence at an easily accessible locality. The Middle‐Upper Cambrian boundary strata are composed of biocalcimicrosparite, indicating the sedimentary environment of an underwater upheaval on the gentle slope along the frontal margin of the Yangtze carbonate platform. For the upper Middle and lower Upper Cambrian agnostid trilobite zones and conodont zones are erected, and a more accurate correlation between the trilobite and conodont sequences is established. Based on these, the Middle‐Upper Cambrian boundary is drawn more reasonably and precisely than what was done before. In short, the section studied is superior to other known sections of Middle‐Upper Cambrian, and it will probably be an ideal candidate for the Middle‐Upper Cambrian boundary stratotype.