Fossil coral dating comedy speed dating up the creek

26-Oct-2018 16:02

Using relative dating the fossil is compared to something for which an age is already known.

For example if you have a fossil trilobite and it was found in the Wheeler Formation.

The Wheeler Formation has been previously dated to approximately 507 million year old, so we know the trilobite is also about 507 million years old.

But, how can we determine how old a rock formation is, if it hasn’t previously been dated?

Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

Index fossils are fossils that are known to only occur within a very specific age range.

Earth’s climate has undergone many changes over the course of geologic history, but the past one million years or so have been among the most dynamic.

During that time, the planet has experienced repeated cycles of glacial (cold) and interglacial (warm) periods lasting about 80,000 years on average.

The U-series dating of fossil coral reefs has been widely utilized to provide absolutely dated records of past sea-level change and numerous observations now exist for the past 130,000 years spanning the last glacial cycle.These were most likely driven by regular changes in Earth’s orbit and rotation known as the Milankovich Cycles that govern the seasonal timing and intensity of solar energy entering the atmosphere.Other factors that may have contributed to the formation and cessation of ice ages are the amount of greenhouse gases (mainly carbon dioxide, methane, and water vapor) in Earth’s atmosphere, the extent of sea and land-based ice across the northern hemisphere, and shifts in patterns of wind and ocean currents.You may find it useful for the clear definitions, and for excellent links on a variety of topic.Stromatolites are the oldest known fossils, dating back more than 3 billion years.

The U-series dating of fossil coral reefs has been widely utilized to provide absolutely dated records of past sea-level change and numerous observations now exist for the past 130,000 years spanning the last glacial cycle.These were most likely driven by regular changes in Earth’s orbit and rotation known as the Milankovich Cycles that govern the seasonal timing and intensity of solar energy entering the atmosphere.Other factors that may have contributed to the formation and cessation of ice ages are the amount of greenhouse gases (mainly carbon dioxide, methane, and water vapor) in Earth’s atmosphere, the extent of sea and land-based ice across the northern hemisphere, and shifts in patterns of wind and ocean currents.You may find it useful for the clear definitions, and for excellent links on a variety of topic.Stromatolites are the oldest known fossils, dating back more than 3 billion years.There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.