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The Code of Life · Chapter 5

Deep Time

The one ingredient too big for a human life to feel

Read rock layers like pages and you meet vanished ammonites, trilobites, and non-avian dinosaurs, plus fossils that combine ancestral and derived traits. Branching fish lineages illuminate the origin of early four-limbed vertebrates; one theropod branch survives as birds. Tiny changes across deep time built life's branching tree.

8 panels · ~6 min read

The biologist and child stand at the foot of a vast layered canyon wall at dawn, its countless rock bands stretching up out of sight.

Panel 1

A giant glowing one-year calendar over the canyon marks strong evidence of life by late March, complex animals in November, dinosaurs in late December, and Homo sapiens in the final 35 minutes.

Panel 2

An undisturbed sedimentary canyon wall like stacked stone pages, with a Cambrian trilobite deepest, a Jurassic ammonite above, and a Late Cretaceous dinosaur fossil higher up.

Panel 3

Three fossils laid on cloth — a spiral ammonite, a segmented trilobite, and a small non-avian theropod skull — beside a modern bird feather representing the surviving avian dinosaur lineage.

Panel 4

A Tiktaalik-like fish remains mostly submerged in ancient shallows, using sturdy lobe fins to support itself on the bottom; it has scales, gills, a tail, and no toes or legs.

Panel 5

A three-tip theropod family tree places a feathered dinosaur, an Archaeopteryx-like relative, and a modern songbird on distinct terminal branches.

Panel 6

A luminous vertebrate tree separates living present-day tips from extinct side branches, with birds nested among dinosaurs and humans on one small mammal twig.

Panel 7

A child traces living cellular lineages backward from right to left toward a braided ancestral population, while earlier history disappears unresolved into mist farther left.

Panel 8

Cover