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"Assessing the Utility of Strontium Isotopes in Fossil Dental Calculus" by Anthony Dosseto, Florian Dux et al.

Strontium (Sr) isotopes measured in fossil remains have been a useful tool to assess the geographical origin and even migrations of humans and other animals. In particular, dental enamel generally represents the ideal material, as it is dense and less prone to diagenetic replacement of Sr post-burial. However, fossil teeth can often be precious artefacts and difficult to access for destructive analysis. Here, we assess whether measuring Sr isotopes in fossil dental calculus could be used at least as a rangefinder to determine the geographical origin of an individual. We measured trace element concentrations in modern calculus (from a local dental practice), and trace element concentrations and 87Sr/86Sr ratios in human fossil calculus, dentine, and enamel from specimens collected in York, UK. Comparing trace element concentrations between modern and fossil calculus show that metals present in fossil calculus are mostly acquired post-burial, including Sr. The relationship between 87Sr/8 ....

United Kingdom , Dental Calculus , Fossil Teeth , Strontium Isotopes ,

Horses lived in the Americas for millions of years – new research helps paleontologists understand the fossils we've found and those that are missing from the record

Horse fossils are abundant and widespread across North America. Scientists often use their long history to illustrate how species evolve in response to a changing environment. ....

United States , Florida Museum Of Natural History , University Of Florida , Stephanie Killingsworth , Charles Darwin , Brucej Macfadden , American Southwest , Ice Age , North America , Florida Museum , Natural History , Fossil Record , Worse Species , North America , Ossil Horses , Orse Fossils , Fossil Teeth , Ancient Horses , University Of Florida ,

Elephant teeth: how they evolved to cope with climate change-driven dietary shifts

Groundbreaking study demonstrates how behaviour drives long-term evolution over 20 million years. ....

South Africa , Eteläuomen Läi , Adrian Lister , University Of Helsinki , Kenya Tsavo East National Park , Juha Saarinen , Tsavo East National Park , African Savannah , Animal Diet , Fossil Teeth ,

A tiny 'ice mouse' with teeth the size of sand grains survived some of the coldest temperatures when dinosaurs roamed the Earth

Scientists found tiny fossil teeth of an "ice mouse" or shrew-like rodent that lived among dinosaurs in the Arctic Circle around 73 million years ago. ....

United States , Prince Creek , Jaelyn Eberle , University Of Colorado , Prince Creek Formation , Arctic Circle , Systematic Palaeontology , Dinosaur Fossils , Fossil Teeth , Jaelyn Eberle , Rctic Shrew ,

Fossil teeth reveal how brains developed in utero over millions of years of human evolution – new research

Using a new equation based on today’s primates, scientists can take a few molar teeth from an extinct fossil species and reconstruct exactly how fast their offspring grew during gestation. ....

Biological Anthropology , Brain Evolution , Brain Size , Fossil Teeth , Homo Sapiens , Human Evolution , Vaginal Delivery ,