A journal of deep time · Number XIV

STRATA

Reading the earth, one layer at a time

QuaternaryThe mammoth steppe's last address2.6 mya

NeogeneGrasslands invent the horse23 mya

Cretaceous · cover story

The day the sky fell is written in a centimetre of clay

A new core from the Chicxulub rim resolves the impact winter week by week — fern spore by fern spore.

66 mya · p. 20

JurassicFeathers before flight — p. 34201 mya

PermianThe Great Dying's slow rehearsal — p. 47299 mya

Precambrian basement « Below this line, four billion years keep their own counsel. » 4,000 mya