Intraspecies variation and biostratigraphic correlation in charophyte population

doi:10.13745/j.esf.sf.2020.6.10

Abstract

Abstract:

Traditional charophyte fossil studies indicated that these fossils played a significant role in the stratigraphic division of the Cretaceous/Paleocene boundary. However, the continental correlation of charophyte species is hard to carry out due to lack of a united taxonomy standard. According to previous studies on modern charophytes, the spiral cells of gyrogonites in one species showed changes from concave to convex due to different degrees of calcification. Therefore, the identification of charophyte fossil taxa based on populations was introduced. Gyrogonite polymorphism is often found in the population of one of the species. If the changes in characteristics are transitional, these different morphologies are called intraspecific variations. Studies of intraspecific variations could provide evidence for species determination and further biostratigraphic correlation between Chinese and international charophyte populations. Palaeoecology and palaeogeography are also important for studying charophyte biostratigraphy. Eurytopic and widely distributed species can be used to denominate biozones, which are beneficial to intercontinental stratigraphic correlation.

Key words: gyrogonite, morphological analysis, intraspecific variation, palaeoecology, palaeogeography

CLC Number:

Q913.84
P52

LI Sha, WANG Qifei, ZHANG Haichun, WAN Xiaoqiao. Intraspecies variation and biostratigraphic correlation in charophyte population[J]. Earth Science Frontiers, 2020, 27(6): 234-240.

Figures/Tables 4

Fig.1 The gyrogonite measurement parameters

Fig.2 Biometric data for P.varians (98 gyrogonites) from the Gejiazhuang section of the Pingyi Basin, Shandong Province. Modified from [14].

Fig.3 Intraspecific variations in charophyte fossils. Modified from [14,18].

Fig.4 Comparison of latest Campanian-early Danian Microchara cristata superzone among the Pingyi, Songliao and Jiaolai basins in China and further with the Ager Basin in Europe. Modified from [27].

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