The 2026 Revised Version · Part Five — Papers 57–61, Revised Chronology · Read the whole part (with its apparatus and change log) · Every paper

Paper 61 — The Mammalian Era

The strongest surviving stretch. Opening moved to 66,000,000 (original 50). 35 million and 25 million: KEPT (Oligocene 33.9, Miocene 23.03 — within the text's own rounding). The horse "as it now is" at ~4.5–5 million: KEPT. Pleistocene opens 2,580,000; "over two million years in length" KEPT with its figure corrected upward. First humans: the date must choose its subject — 2,800,000 for the genus, ~300,000 for the species; the original's 1,000,000 stands between them and is struck for one or the other. The ice age's end: 11,700 years ago (not 35,000).

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