A 113-million-year-old pterosaur bone from Brazil preserved its soft tissues and molecular biomarkers through a multi-stage mineral formation process triggered by bacteria. According to Gram Research analysis, acidic conditions from microbial decay first caused phosphate minerals to form and stabilize the tissues, followed by three layers of carbonate minerals that sealed everything from further decay. Chemical analysis of the preserved steroids revealed the pterosaur ate fish and cephalopods, demonstrating how exceptional fossil preservation can reveal ancient animal diets.
Scientists discovered something amazing in a pterosaur wing bone from Brazil that’s 113 million years old: it still contains soft tissue, minerals, and even molecular traces of what the ancient flying reptile ate. By studying how the bone was preserved, researchers found that bacteria breaking down the carcass created acidic conditions that triggered a chain reaction of mineral formation. First, phosphate minerals locked in the soft tissues, then layers of carbonate minerals wrapped around everything like a protective shield. This discovery helps scientists understand how ancient creatures’ remains can survive for millions of years and what their diets were like.
Key Statistics
A 2026 research article analyzing a single pterosaur wing bone from Brazil found that multi-stage mineralization—beginning with phosphate formation and followed by three phases of carbonate mineralization—preserved soft tissues and molecular biomarkers for 113 million years.
Steroid biomarker analysis of the 113-million-year-old pterosaur fossil revealed carbon isotope signatures indicating the ancient flying reptile’s diet consisted primarily of fish and cephalopods, demonstrating that dietary information can survive fossilization through exceptional mineral preservation.
Microbial sulfate production, evidenced by barite and celestite minerals in the pterosaur fossil, created the acidic, oxidative microenvironment necessary for early phosphate mineralization that stabilized soft tissues before they could decompose.
The Quick Take
- What they studied: How and why a pterosaur bone from 113 million years ago preserved its soft tissues, minerals, and chemical traces of the animal’s diet so well
- Who participated: One pterosaur wing bone fossil from Brazil, analyzed using advanced laboratory techniques to examine its mineral structure and chemical composition
- Key finding: A multi-stage process of mineral formation, triggered by bacteria breaking down the carcass and creating acidic conditions, preserved the bone’s soft tissues and molecular biomarkers for over 100 million years
- What it means for you: This research helps paleontologists understand how to find and interpret ancient fossils with preserved soft tissues, potentially revealing diet, physiology, and behavior of extinct animals. However, this is a single specimen study, so findings apply specifically to this pterosaur rather than all pterosaurs
The Research Details
Scientists examined a single pterosaur wing bone fossil using multiple high-tech methods. They used organic geochemical analysis—basically breaking down and identifying the chemical compounds preserved in the bone—combined with detailed microscopic imaging to see the different mineral layers. Think of it like using a microscope and chemistry lab to read the fossil’s history layer by layer. The researchers looked for steroid biomarkers (chemical signatures of living tissue) and traced how different minerals formed in sequence around the bone. They also analyzed carbon isotopes (different forms of carbon atoms) to determine what the pterosaur ate based on the chemical fingerprints left in its tissues.
Understanding how fossils preserve their soft tissues and molecular information is crucial because most fossils only show us bones and shells. When scientists can find preserved proteins, fats, and other molecules, they can learn directly about what ancient animals ate, how their bodies worked, and what their environment was like. This study reveals the specific chemical conditions that make such preservation possible, which helps researchers know where and how to look for other well-preserved fossils.
This is a detailed, peer-reviewed study published in a reputable scientific journal (iScience). The researchers used multiple advanced analytical techniques to verify their findings, which strengthens confidence in their conclusions. However, because it examines only one fossil specimen, the findings are specific to this particular pterosaur rather than representing all pterosaurs or all fossil preservation processes. The study is recent (2026) and represents cutting-edge paleontology research.
What the Results Show
The pterosaur bone survived through a carefully orchestrated sequence of mineral formation events. First, bacteria breaking down the dead pterosaur created acidic, oxygen-rich conditions around the carcass. This acidity triggered the formation of fluorapatite, a phosphate mineral that essentially locked in and stabilized the soft tissues before they could decompose completely. The fluorapatite layer contained evidence of enhanced bacterial sulfate production, shown by the presence of barite and celestite minerals—these are sulfate-based minerals that form in specific microbial environments. Following this initial phosphatization phase, three additional layers of carbonate minerals (calcium carbonate compounds) formed around the bone, creating a protective shell that sealed off the organic material from further chemical alteration. This multi-layered mineral armor prevented the soft tissues and molecular biomarkers from breaking down over the subsequent 113 million years.
The molecular analysis revealed steroid biomarkers—chemical compounds that only come from living tissue—still present in the fossil. The carbon isotope signatures of these steroids indicated that the pterosaur ate primarily fish and cephalopods (squid-like creatures), providing direct evidence of its diet. This finding is significant because it shows that not only can soft tissues be preserved, but the chemical information about the animal’s lifestyle can survive fossilization. The specific pattern of mineral formation also provides a roadmap for understanding taphonomy—the science of how organisms become fossils—and the environmental conditions that must exist for such exceptional preservation.
This research builds on previous discoveries of exceptionally preserved fossils but provides new mechanistic understanding of how the preservation actually happens. While scientists have found other fossils with soft tissue preservation, this study is among the first to comprehensively document the step-by-step mineral formation process and connect it directly to microbial activity and redox chemistry. The findings support earlier theories about the importance of rapid mineralization in fossil preservation but add specific details about the role of acidic, oxidative conditions and sequential mineral phases.
This study examines a single fossil specimen, so the preservation pathway described may not apply to all pterosaurs or all fossils in general. The specific conditions that led to this exceptional preservation—the particular soil chemistry, bacterial community, and environmental factors in ancient Brazil—may have been unique. Additionally, while the researchers identified steroid biomarkers and interpreted them as dietary evidence, the interpretation relies on assumptions about how these molecules change over time. The study cannot tell us whether this level of preservation is common or extremely rare among pterosaur fossils.
The Bottom Line
For paleontologists and fossil hunters: Look for fossils in depositional environments where acidic, oxygen-rich conditions would have developed around carcasses, as these conditions appear optimal for soft tissue preservation. For educators and science communicators: This research demonstrates how multiple scientific disciplines (chemistry, microbiology, geology) combine to solve paleontological mysteries. Confidence level: High for the specific fossil studied; moderate for generalizing to other specimens.
Paleontologists, evolutionary biologists, and museum curators should care about this research because it provides a blueprint for identifying and interpreting exceptionally preserved fossils. Geology and chemistry students can learn from the multi-disciplinary approach. The general public interested in dinosaurs and prehistoric life will find this relevant to understanding how we know what ancient animals ate and how they lived. This research is less directly applicable to medical or nutritional science.
This is a one-time discovery and analysis rather than an intervention with expected timelines. However, the insights could guide future fossil discoveries over the coming years and decades as paleontologists apply these preservation principles to their fieldwork.
Frequently Asked Questions
How do scientists know what extinct animals ate?
By analyzing preserved chemical compounds called steroids in fossils, scientists can determine diet through carbon isotope signatures. In this 113-million-year-old pterosaur, these chemical fingerprints showed it ate fish and cephalopods, providing direct evidence of ancient feeding habits.
Why do most fossils only show bones and not soft tissue?
Soft tissues decompose quickly unless special conditions preserve them. This pterosaur fossil survived because bacteria created acidic conditions that triggered mineral formation, which locked in soft tissues before decay. Most fossils lack these specific chemical conditions.
Can scientists find preserved DNA in 113-million-year-old fossils?
This study found preserved steroids and other biomarkers but doesn’t mention DNA recovery. DNA typically degrades much faster than other molecules, making 113-million-year-old DNA extremely unlikely, though exceptional preservation conditions might theoretically allow some molecular survival.
What role do bacteria play in fossil preservation?
Bacteria breaking down the pterosaur carcass created acidic conditions that triggered phosphate mineral formation, which stabilized soft tissues. This microbial activity, while normally causing decay, paradoxically enabled preservation by initiating the protective mineralization process.
Want to Apply This Research?
- If using a paleontology or fossil tracking app: Record fossil discovery locations with soil pH, oxygen levels, and mineral composition data. Track which environmental conditions correlate with soft tissue preservation in your region’s fossil sites.
- For fossil enthusiasts or amateur paleontologists: Document the geological context of any fossils you find, noting soil color, mineral deposits, and surrounding rock types. This contextual information helps professional scientists understand preservation conditions.
- Long-term: Maintain detailed field notes on fossil sites showing patterns of mineral formation and preservation quality. Compare preservation outcomes across different depositional environments to identify which conditions most consistently preserve soft tissues and biomarkers.
This research describes the preservation of a single 113-million-year-old pterosaur fossil and does not constitute medical, nutritional, or health advice. The findings are specific to this particular specimen and may not apply to all pterosaurs or all fossil preservation scenarios. This article is for educational and informational purposes only. For questions about paleontology or fossil science, consult with qualified paleontologists or museum professionals.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.