To: combjelly who wrote (67475 ) 4/20/2018 10:07:54 AM From: TimF Respond to I mentioned land plants for a reason. They are a lot more effective at sequestering carbon. Land plants evolved from a group of green algae , perhaps as early as 850 mya, [8] but algae-like plants might have evolved as early as 1 billion years ago. [7] ... 1,200 million years ago, [11] and microbial fossils have been found in freshwater lake deposits from 1,000 million years ago, [13] but the carbon isotope record suggests that they were too scarce to impact the atmospheric composition until around 850 million years ago. [8] These organisms, although phylogenetically diverse, [14] were probably small and simple, forming little more than an algal scum. [11] However, evidence of the earliest land plants occurs much later at about 470Ma, in lower middle Ordovician rocks from Saudi Arabia [15] and Gondwanaen.wikipedia.org Equisetum ), and progymnosperms, intermediate between seedless vascular plants and the seed plants. While the early forms were small & lacked woody tissue, the first tree-like plants (including progymnosperms and tree-sized lycophytes) had appeared by the mid-Devonian.sci.waikato.ac.nz
