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But dinosaurs didnât appear until about 230 million years ago. Mammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years.And recorded civilization has lasted only about 5,000 years.ammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years. And recorded civilization has lasted only about 5,000 years.
Dinosaurs 1st appeared in the fossil record about 230 million years ago during the middle to late triassic period.he first plants with spores, which indicates that they were land  plants, appeared in the Middle Ordovician period, about 470 million  years ago. First records of tetrapods â¦ , or land animals, show up in  the fossil record around 370 million years ago. 2 people found this useful.