Paleocanna tentaculum’ was more closely related to today’s marine invertebrates than its prehistoric relatives.

Thallium isotopes show O2 levels rose and fell at the ocean floor long after marine animals appeared and diversified half billion years ago, according to study of ancient marine sediments exposed by ...

Showing the Paleozoic sedimentary rock sequence at the Grand Canyon - from which samples were collected for this study. The steep cliffs are of marine limestone or dolomite formations. New study ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...