Open AccessOn the origin of dimorphograptids
Author(s) -
Li Jin
Publication year - 1987
Publication title -
bulletin of the geological society of denmark
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 28
eISSN - 2245-7070
pISSN - 0011-6297
DOI - 10.37570/bgsd-1986-35-18
Subject(s) - stage (stratigraphy) , group (periodic table) , china , series (stratigraphy) , paleontology , geology , geography , archaeology , chemistry , organic chemistry
Previous authors usually considered the Diplograptus stage-> Akidograptus stage-> Rhaphidograptus stage -> Dimorphograptus stage to be an evolutionary series. After research on material of dimorphograp tids from the Lower Silurian Kaochiapien Formation, southern Anhui in China, and taking into account the results from analyses on dimorphograptids in general, the writer considers that Dimorphograptus of the elongatus group and Bulmanograptus of the confertus group probably evolved from Parakidograptus, while Dimorphograptus of the hubeiensis group and Bulmanograptus of the deminutus group probably evolved from Glyptograptus and Rectograptus respectively. Rhaphidograptus probably evolved from Climacograptus.