In a groundbreaking discovery, Australian scientists have identified fossilized blood within dinosaur bones, a finding that could fundamentally alter our understanding of fossil preservation and even offer new perspectives in the search for life beyond Earth.
This landmark discovery, detailed in the Proceedings of the National Academy of Sciences, marks the first time fossilized blood has been confirmed in dinosaur remains. The prehistoric plasma was found within a leg bone of a juvenile Aratasaurus museunacionali, a theropod dinosaur that lived approximately 115 million years ago during the early Cretaceous period. The fossil was originally recovered from a mine in Brazil in 2008.
The researchers detected vascular canals within the fossil containing red blood cells. While previous discoveries have hinted at the possibility of fossilized red blood cells, this study is the first to chemically confirm the presence of hemoglobin-derived molecules. Through highly sensitive chemical analysis, scientists were able to identify and quantify substances including high levels of preserved heme, the component of hemoglobin responsible for carrying oxygen.
Additionally, the analysis revealed the presence of hausmannite, a complex manganese oxide. This compound appears to have helped stabilize the cellular structure of the heme and other blood biomolecules, such as amino acids found in collagen, during the fossilization process.
Kliti Grice, a chemist at Curtin University and co-author of the study, suggested that the dinosaur was likely rapidly buried in an environment rich in microbes but low in oxygen, which may have contributed to the exceptional preservation. Grice theorizes that this manganese mineralization could have played a crucial role in stabilizing delicate cell structures over millions of years, challenging the long-held assumption that molecules like hemoglobin cannot survive such deep time.
"These findings challenge longstanding assumptions that certain biomolecules such as hemoglobin cannot survive deep time," Grice stated. "By analyzing our primeval predecessor’s plasma, researchers can glean earth-shattering insights into ancient life."
Further analysis of this ancient blood could provide deeper insights into dinosaur physiology, such as their evolution and activity levels. The implications of this discovery extend beyond paleontology, potentially influencing the search for extraterrestrial life. If such delicate organic molecules can persist for millions of years on Earth, similar traces might conceivably exist elsewhere in the cosmos.
The study's findings also raise questions about how this discovery might impact ongoing efforts to bioengineer extinct animals.