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Prehistoric Time Line, Geologic Time Scale, Photos, Facts, Maps, and More

Prehistoric Time Line, Geologic Time Scale, Photos, Facts, Maps, and More
Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5-billion-year history. A lot has happened in that time. Earth formed and oxygen levels rose in the foundational years of the Precambrian. The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates, amphibians, and reptiles. Dinosaurs ruled the Earth in the mighty Mesozoic. And 64 million years after dinosaurs went extinct, modern humans emerged in the Cenozoic era.

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Geologic Time Scale I Title: Geologic Time Scale IAuthor: Tamara McDaniel, Lake Geneva Middle School 600 Bloomfield Rd. Lake Geneva, WI Grades: 7-8 (Spiraled) (See Geologic Time Scale II for the 8th grade activity) Overview of Lesson: Students will research the geologic time scale. PREHISTORY When men and women started to live in villages, there was a specialization of work. Some people cultivated fields, other people looked after the animals and others made weapons, fabrics, and other objects. There were two important technical innovations in the Neolithic Age: fabrics and pottery. They produced fabrics from animals’ wool using tools like bone spindles, and rudimentary looms. Pottery was made by hand and baked in a bonfire. New objects were invented such as vessels to hold the grain, bowls for eating and cooking, etc.

Geologic Time Projects/Labs: lewiston Radiometric Dating Atom Decay and Half-Life Simulation. Click Link: Alpha Particles = 2 protons and 2 neutrons bonded together into a particle identical to a helium nucleus. Halflife The applet lists a "halflife" for each radioactive isotope. What does that mean? The halflife is the amount of time it takes for half of the atoms in a sample to decay. The halflife for a given isotope is always the same ; it doesn't depend on how many atoms you have or on how long they've been sitting around. For example, the applet will tell you that the halflife of beryllium 11 is 13.81 seconds. Let's say you start with, oh, 16 grams of 11Be.

Geologic time scale Online exhibits Geologic time scale Take a journey back through the history of the Earth — jump to a specific time period using the time scale below and examine ancient life, climates, and geography. You might wish to start in the Cenozoic Era (65.5 million years ago to the present) and work back through time, or start with Hadean time (4.6 to 4 billion years ago)* and journey forward to the present day — it's your choice. [Note: "mya" means "millions of years ago"] GEOLOGIC EONS, ERAS and PERIODS - Paleontology and Geology Glossary Advertisement. is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages.Click here to learn more. (Already a member? Click here.) Click on an underlined word for more information on that subject.If the dinosaur or paleontology term you are looking for is not in the dictionary, please e-mail us.

Fossil Fishes of the Bear Gulch Limestone The Bear Gulch Limestone (Mississippian of Montana) is what is known as a lagerstätte, a well-bedded sequence of limestone layers containing an extremely well-preserved assemblage of fossils. This deposit has yielded one of the most diverse and well preserved fossil fish assemblages in the world. We have excavated approximately 130 species of fish from this deposit over the last 35 years. FINDASAURUS CRAIG A. MUNSART and KAREN ALONZI-VAN GUNDY ONE WAY to find out more information about dinosaurs is to discover more dinosaur fossils. The type of rocks in which dinosaur fossils (and almost all other fossils) are found is called sedimentary rock.

BBC Nature - Big Five mass extinction events