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From 405 million to 425 million years ago
Answer for the clue "From 405 million to 425 million years ago ", 8 letters:
silurian
Alternative clues for the word silurian
Word definitions for silurian in dictionaries
Wikipedia
Word definitions in Wikipedia
The Silurians are a fictional race of reptile -like humanoids in the long-running British science fiction television series Doctor Who . The species first appeared in Doctor Who in the 1970 serial Doctor Who and the Silurians , and were created by Malcolm ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Silurian \Si*lu"ri*an\, n. The Silurian age.
Douglas Harper's Etymology Dictionary
Word definitions in Douglas Harper's Etymology Dictionary
1708, "pertaining to the Silures," from Latin Silures "ancient British tribe inhabiting southeast Wales." Geological sense is from 1835, coined by Sir Roderick Impey Murchison (1792-1871) because rocks of this period are especially frequent in Wales.
Usage examples of silurian.
Therefore it is quite possible, as we have seen in the case of some Silurian forms, that a species might go on being slightly modified in relation to its slightly altered conditions of life, and yet retain throughout a vast period the same general characteristics.
We shall see this by turning to the diagram: the letters, A to L, may represent eleven Silurian genera, some of which have produced large groups of modified descendants.
No, strike that, the Silurian grayfish Phlox had swimming in his tank down in sickbay could do a better job.
Empty platforms rushed past, their names in title: Cambrian, Ordovician, Silurian, Devonian, Permian, Triassic, Jurassic.
The Silurian period follows the Ordovician, and the Miocene epoch follows the Oligocene as surely as Wednesday follows Tuesday.
Silurians alone were silent as the spears splintered the pavement and the warrior cheers echoed in the smoky cavernous dark.
Silurians ran screaming from their line and hurled their long spears at the centre of our defence.
The two men unbound their hair, took up their spears and swords, then danced in front of the Silurian line.
I need give only one instance, namely, the manner in which the fossils of the Devonian system, when this system was first discovered, were at once recognised by palaeontologists as intermediate in character between those of the overlying carboniferous, and underlying Silurian system.
Why do we not find great piles of strata beneath the Silurian system, stored with the remains of the progenitors of the Silurian groups of fossils?
Barrande has lately added another and lower stage to the Silurian system, abounding with new and peculiar species.
In 1839, when Roderick Murchison published The Silurian System, a plump and ponderous study of a type of rock called greywacke, it was an instant bestseller, racing through four editions, even though it cost eight guineas a copy and was, in true Huttonian style, unreadable.
The issue arose when the Reverend Adam Sedgwick of Cambridge claimed for the Cambrian period a layer of rock that Roderick Murchison believed belonged rightly to the Silurian.
The cliffs are early Triassic sandstone laid atop Permian coal measures, under which lie the granites, shales and limestones of Devonian and Silurian times.
So the Old Silurian seas were opened up to breed the fish in, and at the same time the great work of building Old Red Sandstone mountains eighty thousand feet high to cold-storage their fossils in was begun.