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ScienceDaily: Fossils & Ruins News |
| Roman noblewoman’s tomb reveals secrets of ancient concrete resilience Posted: 08 Oct 2021 10:41 AM PDT Over time, concrete cracks and crumbles. Well, most concrete cracks and crumbles. Structures built in ancient Rome are still standing, exhibiting remarkable durability despite conditions that would devastate modern concrete. One of these structures is the large cylindrical tomb of first-century noblewoman Caecilia Metella. New research shows that the quality of the concrete of her tomb may exceed that of her male contemporaries' monuments because of the volcanic aggregate the builders chose and the unusual chemical interactions with rain and groundwater with that aggregate over two millennia. |
| The climate-driven mass extinction no one had seen Posted: 07 Oct 2021 11:58 AM PDT Two thirds of all mammals vanished from Africa and the Arabian Peninsula around 30 million years ago, when the climate on Earth changed from swampy to icy. But we are only finding out about this mass extinction now. Researchers examined hundreds of fossils from multiple sites in Africa, built evolutionary trees, and pinpointed each species' first and last known appearances. The climate shift 'was a real reset button.' |
| Ten millennia of hepatitis B virus evolution described Posted: 07 Oct 2021 11:58 AM PDT Researchers uncover the evolution of the hepatitis B virus since the Early Holocene by analyzing the largest dataset of ancient viral genomes produced to date. |
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