WebJun 20, 2013 · Life in the Paleozoic. The Paleozoic began with the Cambrian Period, 53 million years best known for ushering in an explosion of life on Earth. This "Cambrian explosion" included the evolution of ... WebThe Precambrian is the earliest of the geologic ages, which are marked by different layers of sedimentary rock. Laid down over millions of years, these rock layers contain a permanent record of the...
Ordovician Period—485.4 to 443.8 MYA - National Park Service
WebCambrian life did not evolve in the blink of an eye. The Cambrian was preceded by many millions of years of evolution, and many of the animal phyla actually diverged during the Precambrian. ... S. & Hedges, S.B. (1999) Divergence time estimates for the early history of animal phyla and the origin of plants, animals and fungi. Proceedings of the ... WebJun 8, 2024 · Figure 27.4 A. 1: Earth’s history: (a) Earth’s history is divided into eons, eras, and periods. The Ediacaran period was the final period of the Proterozoic Era which ended in the Cambrian period of the Phanerozoic Era. (b) Stages on the geological time scale are represented as a spiral. The earliest life comprising Ediacaran biota was long ... seattle school choice form
27.4: The Evolutionary History of the Animal Kingdom
WebFeb 23, 2024 · Date range: 419.2 million years ago to 358.9 million years ago Length: 60.3 million years (1.3% of geologic time) Geologic calendar: November 28 (6 PM)–December 3 (1 PM) (4 days, 19 hours) Devonian age fossil brachiopod, Death Valley National Park, California and Nevada. NPS image Introduction WebCambrian Period, earliest time division of the Paleozoic Era, extending from 541 million to 485.4 million years ago. The Cambrian Period is divided into four stratigraphic series: the Terreneuvian Series (541 million to 521 million years ago), Series 2 (521 million to 509 … Ordovician Period, in geologic time, the second period of the Paleozoic Era. It … Permian Period, in geologic time, the last period of the Paleozoic Era. The Permian … Silurian Period, in geologic time, the third period of the Paleozoic Era. It began … Proterozoic Eon, the younger of the two divisions of Precambrian time, the older … The Cambrian explosion was a sharp and sudden increase in the rate of evolution. … Phanerozoic Eon, the span of geologic time extending about 541 million years from … WebCambrian echinoderms were predominantly unfamiliar and strange-looking types such as early edrioasteroids, eocrinoids, and helicoplacoids. The more familiar starfish, brittle … pulamed co bw