All these microfossils were successively considered as green algae, red algae, "phylloid" algae, or fibres of calcispongia.
DANIEL VACHARD, PEDRO CÓZAR 2006, 'THE FAMILY CALCIFOLIACEAE EMEND.,MISSISSIPPIAN-EARLY PENNSYLVANIAN ALGAE', Rivista Italiana di Paleontologia e Stratigrafiahttps://riviste.unimi.it/index.php/RIPS/article/view/5848. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
With an increase of terrestrial input, the phylloid algal community was again replaced by the bryozoan community.
Ke-Yu Zhu, Tan Wang, Zhi-Xing Yi, Yong-Biao Wang 2018, 'Evolution of sedimentary facies and fossil communities in the Middle Permian MaokouFormation in Zigui County, Hubei Province, South China', Journal of Palaeogeographyhttp://www.sciencedirect.com/science/article/pii/S2095383617300901. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)