摘要
华北中寒武统与上寒武统界线问题,实际上也涉及崮山组时代的归属问题。国外学者如B.Willis和E.Blackwelder(1907),C.D.Walcott(1913),A.W.Grabau(1924),T.Kobayashi(1935)和R.Endo(1937)等认为崮山组应归中寒武世晚期。1959年由Moore主编的《三叶虫专著》(Treatise on Invertebrade Palaeontology Part O.)
The trilobites Cyclorenzelltt, Damesella, Dorypygella,Blackwelderia, Teinistion, Feronopsis and Iniosphenisctts?were collected from the Tangwangzhi and Jingziyu sections at the basal Kunshan Formation. Of these trilobites, Damesella, Peronopsis, Iniospheniscus?,etc. are the Middle Cambrian index fossils and Cyclolorenzella, Dorypygella,Blackwelderia and Teinistion are common in the Late Cambrian Kunshan Formation. Therefore, the fauna bears a nature of transitional type from the Middle to Late Cambrian. The transitional bed is late Middle Cambrian in age because it yields the Middle Cambrian index fossils. The overlying strata yield abundant trilobites Pseudagnostas, Homagnostus,Liaoningaspis, Cyclolorenzella, Blackwelderia, Teinistion, Bergeronites and Monkaspis, being of early Late Cambrian age. For this reason, the authors propose that the Middle Cambrian-Upper Cambrian boundary be placed between the uppermost part of the transitional bed and the lowermost part of the Kunshan Formation containing Pseudagnostus,Homagnostus, Liaoningaspis,Monkaspis and Bergeronites.
出处
《地层学杂志》
CSCD
北大核心
1989年第1期40-46,共7页
Journal of Stratigraphy
