Smithsonian researchers trekked to a remote site in northern Canada to collect four-billion-year-old rock samples that could ...

Body size evolution of Cambrian-Ordovician trilobites in Laurentia (B), East Gondwana (C), West Gondwana (D), Baltica and Avalonia (E). Three episodes of change in body size during Cambrian Age 4 ...

The fossil came from a layer in the rocks known as the "La Matilde Formation," from which adult N. degiustoi, which are notable for their giant size, have previously been unearthed. "As with most ...