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Chinese and foreign paleontologists discovered ancient exquisite microscopic fossils in the "boring billion years" |
China News Service, Nanjing, July 19 (Reporter Yang Yanci) According to a news from the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences on the 19th, researchers from the Institute collaborated with Swedish scientists in the Mesoproterozoic Xiamaling Formation, which was 1.
36 billion years ago in Jizhou District, Tianjin.
In the bottom strata, a large number of exquisitely preserved organic matter wall microscopic fossils have been obtained, including 12 types of eukaryotic fossils
.
This study has preliminarily ascertained the micro-fossil composition and the diversity of eukaryotic fossils in the Xiamaling Formation
.
Relevant research results have been recently published in the international geoscience journal "Precambrian Research" (Precambrian Research)
.
The mid-Proterozoic period between 1.
85 billion and 850 million years ago is considered to be the "boring billion years" in the history of the earth, but from the perspective of life evolution, it is the origin and early evolution of eukaryotes.
Critical period
.
The study of fossil records and molecular clocks shows that many major evolutionary events occurred in eukaryotes during this period
.
However, there are still too many unknowns and puzzles about the origin and early evolution of eukaryotes, such as the specific time and reliable fossil evidence of these major events in the early evolution of eukaryotes, and the biological relationship of early eukaryotic fossils.
The Yanshan area of North China has extensively exposed mid-Proterozoic sedimentary strata, rich in fossil resources, and is an ideal area for research on the origin and early evolution of eukaryotes
.
In recent years, Zhu Maoyan's research group at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences has repeatedly made important discoveries in this set of strata, including the oldest known eukaryotic fossils in the world and large multicellular eukaryotic fossils
.
According to researchers, the Mesoproterozoic Xiamaling Formation (before 1.
36 billion) in this area is a set of sedimentary strata dominated by dark shale, with high organic matter content but low maturity, which is the focus of China's unconventional oil and gas resource exploration One of the layers
.
Recently, Miao Lanyun, a postdoctoral fellow in the Zhu Maoyan research group of Nanjing Institute of Palaeontology, and Professor Malgorzata Moczydlowska of Uppsala University in Sweden, obtained a large number of exquisitely preserved organic matter in the bottom strata of the Mesoproterozoic Xiamaling Formation which was 1.
36 billion years ago in Jizhou District, Tianjin.
Micro-fossils
.
This study found that the microfossils in the bottom strata of the Xiamaling Formation are very beautifully preserved, with a color ranging from light yellow to dark brown.
They are mainly composed of single cell types, filaments and cell aggregates, including 28 genera and 36 types of microfossils , Including 1 new genus, 1 new species and 5 unnamed types
.
Among them, more than half of the fossil types were discovered in this group for the first time, indicating that the diversity of microfossils in the Xiamaling Formation is much higher than previously recognized
.
In general, the micro-fossil composition of the Xiamaling Formation is similar to the strata in other regions of the world at the same time, but the diversity is slightly higher
The research was jointly funded by the National Natural Science Foundation of China and the Strategic Leading Science and Technology Project (Category B) of the Chinese Academy of Sciences
.
(Finish)