Post #13
Tiktaalik is good evidence for common descent in that it was predicted to exist in shallow marine mid devonian rock, dated older than fish dominated rocks such as in the early devonian but younger than reptile dominated rocks such as in the Carboniferous. It's prescense in rock of shallow marine origins also lends credence to the idea that fish would evolve to walk on land in areas in which water is shallow and where this water meets land. Indeed the neighboring terrestrial mid devonian rocks did not contain tiktaalik like species, nor did the deep marine rock to the east. Only the shallow marine of what the geology shows was a continental margin.
And of course anyone can look at images of tiktaalik to see it has scales, gills and fins like a fish, while it also has a flat head and unfused neck much like an amophibious salamander. It also has robust pectoral girdles much like a salamander, and wrist bones like a salamander as well. And yet...clearly it's a fish with fins and scales. So it has features of both fish and amphibian tetrapodomorph, and it's been found in rock where it was predicted to be, specially up in the Canadian arctic, as well as vertically, lithologically and superpositionally in shallow marine rock.
And there have been other shallow marine tetrapodomorph tracks also found in the early devonian as well in Poland. Between the two, along with a whole collection of Hybrid fossils, this lends credence to the suggestion that the Cambrian, ordovician and silurian were dominated by marine fauna, and sometime in the early to mid devonian they evolved to walk on land. Then by the late devonian we have domination of strata by tetrapods and salamander like fauna. Then by the Carboniferous you have reptile like amphibians and amphibian like reptiles, lizard salamander hybrids etc.
If the first tetrapods were found in the Cambrian or ordovician, or even the Carboniferous, Permian, mesozoic (Triassic, jurassic, cretaceous) or cenozoic (tertiary, pleistocene, pliocene, miocene, oligocene etc.), it would disprove evolution. But here tiktaalik lay, between earlier fish and later amphibious salamander in the devonian.
@inquiring mind 's response? "shaky and weak biological evidence at best, with no fossil record to support it."
Lol.
