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The fossil record preserves little fragments and snapshots of life through time, so while we may never find the first real dinosaur, we can have a good whack at what the earliest dinosaur species was based on what the fossil record yields to us.

might be the earliest dinosaur we know of, or just outside the group and actually what we call a dinosauriform.

1 ), paleontologists agree that all known Cretaceous eutherians were small ( The timing of placental mammal evolution.

In modern evolutionary divergence analysis the role of geological information extends beyond providing a timescale, to informing molecular rate variation across the tree.The resulting divergence estimates are younger than others published recently, and provide the long-anticipated molecular signature for the placental mammal radiation observed in the fossil record near the 66 Ma Cretaceous–Paleogene extinction event.Molecular dating has been transformed by relaxed clock methods that allow the rate of molecular evolution to vary across the phylogeny ( Sanderson 1997 ; Thorne and Kishino 2002 ; and see Welch and Bromham 2005 ). Direct reading of the fossil record suggests that eutherian mammals, including their crown group (placentals), underwent an extraordinary taxonomic and morphological diversification following the extinction of non-avian dinosaurs at the Cretaceous–Paleogene boundary (KPg), 66 Ma.In contrast, the Li–Tanimura method gave estimates consistent with the known evolutionary sequence of seed plant lineages and with known fossil records.Combining estimates calibrated by two known fossil nodes and the Li–Tanimura method, we propose that monocots branched off from dicots 140–150 Myr ago (late Jurassic–early Cretaceous), at least 50 Myr younger than previous estimates based on the molecular clock hypothesis, and that the core eudicots diverged 100–115 Myr ago (Albian–Aptian of the Cretaceous).

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