starting about 2.500,000,000 years ago, sedimentary rocks affected by higher amounts of oxygen in the atmosphere, appear red, as though rusted. Fossils include earliest fish, but of types very different from modern ones. signs of the "tentative presence" of plants on land.
Mesoproterozoic from 1,600,000,000 to 1,000,000,000 years ago. Particular importance attaches to occurred around 1,300,000,000 years ago during the late Mesoproterzoic era, after the earth's transition to a more highly oxygenated atmosphere with an ozone screen. Deposits that made Westmorland Green slate formed around 450 million years ago. About 50 million years later, the material was altered by heat and pressure (metamorphosed) to slate, during mountain-building. After many more millions of years, they resembled patches of moss a few centimeters high.
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The Irish circles of the Early Bronze Age, however, are much smaller and quite unlike British examples such as Callanish, Avebury and Stonehenge.
They could have been erected by rather small groups of people - even single extended families. And some are intimately associated with alignments or Stone-rows and circles filled with stones.
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The company replied that the significance of Google was less as a Facebook competitor than as a means of gathering and connecting user information from Google's various services.