Geologists have been baffled by perforations in an Australian quartzite (rock), identical in shape to burrows made in sands by crustaceans; the original sandy sediment is a billion years older than ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Evidence suggests that microbes existed on Earth as far back as 3.7 billion years ago, a billion ...

For centuries, we have marveled at the prints left by animals who existed thousands of years ago. But one enduring mystery remains: why do some animals leave behind beautifully preserved remains, ...

Animals originated in a world with marine oxygen levels only a fraction of those found in today's oceans. Observations of microbial habitats in present-day lagoons suggest that early animals could ...