Do you feel curious to know about the continents or major landforms of the Earth? Do you know how the Earth was a billion of years ago? Through gradual development and different natural and geological factors the Earth shaped itself to today's modern world. It is really interesting to know that the lands which are controlled by modern technologies and hold some of the excellent instances of man's genius were once full of volcanic activities, wild seas, rivers, oceans, and different types of extinct species. Even, at the beginning there were also fewer traces of life in the form of some organisms. Earth was devoid of proper oxygen and it was only weird features in everywhere. Gradually there formed different landforms including oceans and seas and life began to evolve for the future. The periods in which different significant happenings and developments took place have found importance in the world's geography. The Stenian period is one such significant period which had contributed to shape our Earth.
Stenian Period: Mesoproterozoic Era
This is the third and final period of the Mesoproterozoic Era. It lasted from 1.2 billion to 1.0 billion years ago and contributed to develop the features of the Mesoproterozoic Era.
Do you know about the first super continent? When it was appeared?
The first supercontinent was Rodinia and it was appeared in the Stenian Period. The event called the Grenville Orogeny gave birth to this first super continent Rodinia. Evidences of this event, Grenville Orogeny are still found today in the mountain ranges of the eastern North America and the Western Europe. Landmass of Rodinia was centered at the south of the equator. The continents were clustered around Laurentina including Greenland and plate of Northern America.
Rodinia was dark and desolate with life in forms of stromatolites
Rodinia was thought to be the desolate and stark place devoid of colonized life. However, as per records there were signs of life in the forms of stromatolites which grew in abundance near the land.
Atmospheric oxygen increased from 1% to 4%.
There was a significant increase in the atmospheric oxygen. It increased from 1% and thought to be of 2 to 4% during the formation of Rodinia. But there was no layer of ozone. The center of Rodinia was a huge floodplain with sedimentary deposits and accumulating silts. As there were no plants flood were abundant and the land suffered from massive floods. Formation of Belt Supergroup, a giant sedimentary rock basin was also known to occur in this period. This basin extended across Montana, British Columbia, Alberta, Washington, and Idaho. These places were then mainly covered with siltstone, sandstone and limestone. Ripples, cracks and stromatolites are beautifully preserved features being the evidence of this belt. It was also proved that this super continent was not only land but it contains inland seas and rivers too. These water bodies were covered with stromatolites, which grew in abundance particularly at the shallower water. Mirovia is the only ocean which surrounded this super continent Rodinia.