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Sentences for "azoic "
The Laurentian and Huronian periods-General nature, divisions, and geographical distribution of the Laurentian deposits-Lower and Upper Laurentian-Reasons for believing that the Laurentian rocks are not azoic based upon their containing limestones, beds of oxide of iron, and graphite-The characters, chemical composition, and minute structure of Eozoön Canadense-Comparison of Eozoön with existing Foraminifera-Archœosphœrinœ-Huronian formation-Nature and distribution of Huronian deposits-Organic remains of the Huronian-Literature.
The earliest rocks in the record are called by geologists the Azoic rocks, because they show no traces of life.
Great areas of these Azoic rocks lie uncovered in North America, and they are of such a thickness that geologists consider that they represent a period of at least half of the 1,600,000,000 which they assign to the whole geological record.
The waters of the warm and shallow lakes and seas of the so-called Azoic period may have teemed with an infinite variety {15}of lowly, jelly-like, shell-less and boneless creatures, and a multitude of green scummy plants may have spread over the sunlit intertidal rocks and beaches.
But as men began to discover and study the Record of the Rocks this belief gave place to the suspicion that many species had changed and developed slowly through the course of ages, and this again expanded into a belief in what is called Organic Evolution, a belief that all species of life upon earth, animal and vegetable alike, are descended by slow continuous processes of change from some very simple ancestral form of life, some almost structureless living substance, far back in the so-called Azoic seas.
There are traces of periods of superabundant ice and snow, of “Glacial Ages,” that is, even in the Azoic period.
It is called the Mesozoic period, to distinguish it from the altogether vaster Palæozoic and Azoic periods (together fourteen hundred millions) that preceded it, and from the Cainozoic or new life period that intervened between its close and the present time, and it is also called the Age of Reptiles because of the astonishing predominance and variety of this form of life.
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