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Paleontology and Evolutionary Biology
Research Guide
What is Paleontology and Evolutionary Biology?
Paleontology and Evolutionary Biology is the scientific study of the life forms that existed in prehistoric times through analysis of fossils and the processes driving evolutionary change across geological time scales.
The field encompasses 117,324 published works documenting fossil records, phylogenetic relationships, and extinction events. Key studies identify four statistically distinct mass extinctions in the marine fossil record during the late Ordovician, Permian, Triassic, and Cretaceous periods (Raup and Sepkoski, 1982). Research also establishes molecular timescales for vertebrate evolution and delayed diversification of present-day mammals (Kumar and Hedges, 1998; Bininda-Emonds et al., 2007).
Research Sub-Topics
Molecular Clock Calibrations in Vertebrate Phylogeny
This sub-topic focuses on using fossil-calibrated molecular clocks to estimate divergence times in vertebrate evolution, addressing rate heterogeneity across lineages. Researchers develop Bayesian models integrating genomic data and paleontological constraints.
Cambrian Explosion and Early Metazoan Divergence
Researchers study the rapid diversification of animal phyla during the Cambrian period using fossil, genomic, and developmental evidence to resolve early bilaterian relationships. This includes debates on ecological triggers and molecular clock discrepancies.
Mass Extinction Recovery Patterns in Fossil Record
This area examines post-extinction biotic recoveries, selectivity patterns, and ecosystem reassembly across 'Big Five' events using marine and terrestrial fossil databases. Studies quantify diversification lags and incumbency effects.
Phylogenomic Methods for Avian Systematics
Researchers apply next-generation sequencing and phylogenomic datasets to resolve deep avian relationships, addressing incomplete lineage sorting and convergence. This includes supraordinal phylogenies and higher-level bird classification.
Allometry in Paleontological Morphometrics
This sub-topic analyzes size-shape relationships across ontogeny and phylogeny using geometric morphometrics on fossil specimens to disentangle evolutionary allometry from heterochrony. Applications span mammals, dinosaurs, and invertebrates.
Why It Matters
Paleontology and Evolutionary Biology informs conservation by revealing how fishing depletes low-productivity chondrichthyan populations, with implications for marine ecosystem stability (Stevens, 2000). It dates critical geological events, such as the Doushantuo Formation between 635 and 551 million years ago, marking the end of the Marinoan glaciation (Condon et al., 2005). Discoveries like new Australopithecus and Homo fossils from Ledi-Geraru, Ethiopia, clarify human evolution during the 3-2 million year ago interval when Homo and Paranthropus first appeared. Phylogenies, such as the comprehensive bird tree using next-generation sequencing, resolve evolutionary relationships essential for biodiversity assessments (Prum et al., 2015). These findings support R packages like paleotree for analyzing fossil phylogenies.
Reading Guide
Where to Start
"Mass Extinctions in the Marine Fossil Record" by Raup and Sepkoski (1982) because it provides a foundational statistical analysis of extinction events using fossil family data, accessible for understanding core paleontological patterns.
Key Papers Explained
"The delayed rise of present-day mammals" by Bininda-Emonds et al. (2007) quantifies post-Cretaceous mammalian diversification, building on the timescale in "A molecular timescale for vertebrate evolution" by Kumar and Hedges (1998) and extinction patterns in "Mass Extinctions in the Marine Fossil Record" by Raup and Sepkoski (1982). "A comprehensive phylogeny of birds (Aves) using targeted next-generation DNA sequencing" by Prum et al. (2015) extends these by resolving avian relationships, linking to saurischian origins in "Saurischian monophyly and the origin of birds" by Gauthier (1986). "Size and shape in ontogeny and phylogeny" by Alberch et al. (1979) connects heterochrony across these phylogenetic frameworks.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Recent preprints examine Nanotyrannus and Tyrannosaurus coexistence at the Cretaceous close, new Australopithecus and Homo fossils from Ledi-Geraru testing human evolution hypotheses, and lead exposure traces in hominid teeth suggesting genetic drivers. News covers Chicago Archaeopteryx for avian bauplan evolution and theropod wrist changes preceding flight.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | The delayed rise of present-day mammals | 2007 | Nature | 2.1K | ✕ |
| 2 | A molecular timescale for vertebrate evolution | 1998 | Nature | 1.9K | ✕ |
| 3 | Mass Extinctions in the Marine Fossil Record | 1982 | Science | 1.7K | ✕ |
| 4 | The effects of fishing on sharks, rays, and chimaeras (chondri... | 2000 | ICES Journal of Marine... | 1.7K | ✓ |
| 5 | A comprehensive phylogeny of birds (Aves) using targeted next-... | 2015 | Nature | 1.6K | ✕ |
| 6 | Size and shape in ontogeny and phylogeny | 1979 | Paleobiology | 1.6K | ✕ |
| 7 | U-Pb Ages from the Neoproterozoic Doushantuo Formation, China | 2005 | Science | 1.3K | ✕ |
| 8 | The Cambrian Conundrum: Early Divergence and Later Ecological ... | 2011 | Science | 1.3K | ✕ |
| 9 | Saurischian monophyly and the origin of birds | 1986 | Biodiversity Heritage ... | 1.3K | ✓ |
| 10 | Vertebrate Paleontology | 1967 | Copeia | 1.2K | ✕ |
In the News
New discoveries of Australopithecus and Homo from Ledi-Geraru, Ethiopia
## Abstract
Chicago Archaeopteryx informs on the early evolution of the avian bauplan
Here we report on the nearly complete and uncrushed 14th specimen of*Archaeopteryx*. Exceptional preservation and preparation guided by micro-computed tomographic data make this one of the best exe...
Reorganization of the theropod wrist preceded the origin of avian flight
The carpus (wrist) of birds has a complex evolutionary history, long known to involve carpal reduction and recently shown to include topological replacement of one carpal (the ulnare) by another (t...
93-Year-Old Paleontological Research Institution Faces ...
such as paleontology, evolutionary biology and science education. The institution’s collection is used by Cornell students and faculty, who regularly volunteer, work and conduct research at PRI.
Op-Ed: This Is No Time to Sit on the Sidelines
Paleontological research in the United States is funded by the Division of Earth Sciences under the auspices of the Geosciences Directorate, which has been supporting our community’s efforts since ...
Code & Tools
The aim of `palaeoverse` is to generate a community-driven software package of generic functions for the palaeobiological community. The package do...
`paleotree`is an R package for transforming, 'a posteriori' time-scaling, and modifying phylogenies containing extinct (i.e. fossil) lineages. In p...
## About paleobuddy: an R package for simulating diversification dynamics, fossil records and phylogenies in R. ### Topics
## Repository files navigation ## FossilSim R package for simulating fossil data on phylogenetic trees under mechanistic models of preservation a...
Introduction and tutorials for the PALEO framework. This repository includes minimal examples and small models that demonstrate Julia workflows and...
Recent Preprints
Paleontology News
Scientists Find a Surprising Link Between Lead and Human Evolution Nov. 16, 2025 Researchers found that ancient hominids—including early humans—were exposed to lead throughout childhood, leaving ...
Frontiers in Ecology and Evolution
Chenyang Cai ### chenyang cai Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences (CAS) Nanjing,China Specialty Chief Editor Phylogenetics, Phylogenomics, and Systematics ] ...
Nanotyrannus and Tyrannosaurus coexisted at the close of the Cretaceous
*Tyrannosaurus rex*ranks among the most comprehensively studied extinct vertebrates 1 and is a model system for dinosaur palaeobiology 1 . As one of the last surviving non-avian dinosaurs,*Tyrannos...
New discoveries of Australopithecus and Homo from Ledi-Geraru, Ethiopia
The time interval between about three and two million years ago is a critical period in human evolution—this is when the genera*Homo*and*Paranthropus*first appear in the fossil record and a possibl...
Organic geochemical evidence for life in Archean rocks ...
## Abstract
Latest Developments
Recent developments in paleontology and evolutionary biology include strong anatomical evidence that Sahelanthropus tchadensis was bipedal, and the discovery of thousands of preserved metabolic molecules inside ancient fossilized bones, providing new insights into prehistoric life (ScienceDaily, Nature, as of January 2026).
Sources
Frequently Asked Questions
What are the major mass extinctions identified in the marine fossil record?
Four mass extinctions stand out statistically from background levels, occurring late in the Ordovician, Permian, Triassic, and Cretaceous periods. A fifth event shows evidence in the data (Raup and Sepkoski, 1982). These events affected invertebrate and vertebrate families.
How did fishing impact chondrichthyan populations?
Chondrichthyans exhibit low productivity due to life-history strategies differing from teleost fishes, leading to poor recovery from fishing pressure. Global stocks face depletion, prompting international concern for marine ecosystems (Stevens, 2000).
What does the molecular timescale reveal about vertebrate evolution?
Molecular clocks calibrate the divergence times of vertebrate lineages using genetic data. This approach provides a timeline for major evolutionary events (Kumar and Hedges, 1998).
When was the Doushantuo Formation deposited?
U-Pb zircon dates from volcanic ash beds place deposition between 635 and 551 million years ago. The base coincides with the termination of the Marinoan glaciation, synchronous with Namibian rocks (Condon et al., 2005).
What is the Cambrian Conundrum?
Major animal clades evolved tens of millions of years before their widespread fossil appearance. This indicates early divergence followed by later ecological success in animal history (Erwin et al., 2011).
How do heterochronic changes relate to morphological evolution?
Quantitative methods describe how ontogenetic shifts produce phyletic trends. This unifies developmental biology with evolutionary ecology in studying size and shape changes (Alberch et al., 1979).
Open Research Questions
- ? How did lead exposure in ancient hominids drive genetic adaptations strengthening human evolution?
- ? Did Nanotyrannus and Tyrannosaurus coexist at the end of the Cretaceous, and what does this imply for biodiversity?
- ? What adaptive contexts led to the first appearances of Homo and Paranthropus 3-2 million years ago in eastern Africa?
- ? How did theropod wrist reorganization enable the origin of avian flight?
- ? What organic geochemical evidence confirms life in Archean rocks?
Recent Trends
Preprints from the last six months report Nanotyrannus and Tyrannosaurus coexistence closing the Cretaceous , new Australopithecus and Homo discoveries from Ledi-Geraru, Ethiopia (2025-08-13), and lead exposure in ancient hominid teeth potentially driving genetic changes (Nov. 16, 2025).
2025-10-30News highlights a 14th uncrushed Archaeopteryx specimen and theropod wrist reorganization before avian flight (2025-07-09).
2025-05-14R packages like palaeoverse, paleotree, paleobuddy, fossilsim, and PALEOtutorials.jl advance computational paleobiology simulations.
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