Gymnosperms, amphibians dominant. Beetles, stoneflies appear. Major extinction of 95% of marine species and 50% of all animal families. Carboniferous: Pennsylvanian: 325. First reptiles, cockroaches and mayflies appear. Extensive coal swamp forests. Sponge reefs. Missippian: 360: Echinoderms, bryozoans dominant in oceans.

Dec 6, 2023 · The Geologic Time Scale is a system used by scientists to describe the timing and relationships between events in Earth's history. It covers a vast expanse of time, from the formation of the planet nearly 4.6 billion years ago to the present day. ... marine animals over geologic time scale. Contents. Development and evolution of the Geologic ...

The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years.. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth.It is a system of chronological dating that uses chronostratigraphy (the process of …

Geological time scale. The vast expanse of geological time has been separated into eras, periods, and epochs. The numbers included below refer to the beginnings of the division in which the title appears. ... Plant and Animal Development: Cenozoic: Quaternary: Holocene (.01) Humans develop "Age of mammals" Extinction of dinosaurs and many other ...

Dec 5, 2024 · The geologic time scale of Earth's past is organized according to events that took place during different periods on the time scale. Geologic time is the same as the age of the Earth: between 4.404 and 4.57 billion years. Look closely for such events as the extinction of dinosaurs and many marine animals.

The geologic time scale divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet. These divisions are ... -Dominant animals: fish-Amphibians, evergreens and ferns appear 443 Silurian Extensive erosion First land plants appear and land animals follow

The Geologic Time Scale GeoloGic era or evenT GeoloGic period GeoloGic epoch Time (mya) major evoluTionary evenT Earth is formed — — 4,500 There is no free oxygen. ... Proterozoic — — 2,500 Eukaryotes evolve. Paleozoic Cambrian — 542 Marine animals diversify. Paleozoic Ordovician — 488 First vertebrates (jawless fish) evolve ...

THE GEOLOGIC TIME SCALE The scale of geologic time is vast, currently estimated at nearly 4.6 billion years. During that time, life evolved into the familiar forms we see ... 375 First land animals (amphibians) 12/2/00 5:52 AM 370 First sharks 12/2/00 3:23 PM 365 First seed plants (ferns) 12/3/00 12:54 AM

Jan 17, 2025 · The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages.The enumeration of those geologic time units is based on stratigraphy, which is the correlation and classification of rock strata. The fossil forms that occur in …

The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ... Students should search for other images online, or draw pictures of plants and animals to place on the time scale. Thought should be given to both when an organism appears on the time scale and when it is ...