And the would be followed by vast ages of parative quiesbsp;when frost, rain and river would wear down the mountain heights and carry great mass of silt to fill and rai the a bottoms and spread the as, ever shallower and wider, over more and more of the land.
There have been “high and deep” ages in the world ’s history and “low and level” ages.
The reader must dismiss from his mind any idea that the surfabsp;of the earth has been growing steadily cooler sinbsp;its crust grew solid.
After that mubsp;cooling had been achieved, the internal temperature cead to affebsp;surfabsp;ditions.
There are trabsp;of periods of superabundant ibsp;and snow, of “Glacial Ages,” that is, even in the Azoibsp;period.
It was only towards the bsp;of the Age of Fishes, in a period of extensive shallow as and lagoons, that life spread itlf out in any effectual way from the waters on to the land.
No doubt the earlier types of the forms that now begin to appear in great abundanbsp;had already been developing in a rare and obscure manner for many scores of millions of years.
And the would be followed by vast ages of parative quiesbsp;when frost, rain and river would wear down the mountain heights and carry great mass of silt to fill and rai the a bottoms and spread the as, ever shallower and wider, over more and more of the land.
There have been “high and deep” ages in the world ’s history and “low and level” ages.
The reader must dismiss from his mind any idea that the surfabsp;of the earth has been growing steadily cooler sinbsp;its crust grew solid.
After that mubsp;cooling had been achieved, the internal temperature cead to affebsp;surfabsp;ditions.
There are trabsp;of periods of superabundant ibsp;and snow, of “Glacial Ages,” that is, even in the Azoibsp;period.
It was only towards the bsp;of the Age of Fishes, in a period of extensive shallow as and lagoons, that life spread itlf out in any effectual way from the waters on to the land.
No doubt the earlier types of the forms that now begin to appear in great abundanbsp;had already been developing in a rare and obscure manner for many scores of millions of years.
But now came their opportunity.
Plants no doubt preceded animal forms in this invasion of the land, but the animals probably followed up the plant emigration very cloly.