"For quite a long time, some geologists have wondered whether there's a cycle of around 30 million years in the geologic record. Many, but maybe even most, [geologists] would say that geological ...

Billions of years ago, the molecular building blocks of life emerged from a complex web of chemical and geological processes.

The northern part of Sierra Nevada still retains its dense layer, making it a snapshot of an earlier stage in this geological cycle. This discovery provides a rare glimpse into the mechanisms ...