What is relative age dating

The more fossils you find at a location, the more you can fine-tune the relative age of this layer versus that layer.

Of course, this only works for rocks that contain abundant fossils.

The science of paleontology, and its use for relative age dating, was well-established before the science of isotopic age-dating was developed.

Nowadays, age-dating of rocks has established pretty precise numbers for the absolute ages of the boundaries between fossil assemblages, but there's still uncertainty in those numbers, even for Earth.

On Earth, we have a very powerful method of relative age dating: fossil assemblages.On other solid-surfaced worlds -- which I'll call "planets" for brevity, even though I'm including moons and asteroids -- we haven't yet found a single fossil.Something else must serve to establish a relative time sequence. Earth is an unusual planet in that it doesn't have very many impact craters -- they've mostly been obliterated by active geology.Conveniently, the vast majority of rocks exposed on the surface of Earth are less than a few hundred million years old, which corresponds to the time when there was abundant multicellular life here.Look closely at the Geologic Time Scale chart, and you might notice that the first three columns don't even go back 600 million years.

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  1. van Wieren Fennville, MI USA - Thursday, August 26, 2004 at (EDT) 4/31 Polar Bears from West and Siberia 70-71 see y'all in San Antonio. Took a step back in time and went into "hootch areas", seeing Mama, Papa, and Baby Sans. I want to say he was also from NY but I dont recall for sure.......anyone know the man? Gilbert "Frenchie" Manasselian PS Doc Laplio, drop me a line if you know...mucho thanks. 2nd platoon...one hear from Brad Homer (our squad Leader) or "twiggy" MOffitt? I FOUND that Base Camp below LZ Mellon...rubber suits,flame throwers etc... Gilbert "FRENCHIE" Manasselian Gilbert "FRENCHIE" Manasselian fresno, c USA - Monday, May 17, 2004 at (EDT) FYI, the Polar Bears will be back in harms way soon. Glover died on 11/23/68 Ryan Kanzler Selah, WA USA - Friday, May 14, 2004 at (EDT) To all of our 196th. I maintain a current roster of 400 Delta / HHC - 4/31 Vets. It took thirty six years but I knew someday I would find him. Doc La Palio HHC, Delta,and Charlie Co's 4/31st "Pro Patria" 68/69. The battle lasted all night and into the next morning. Because of privacy concerns they will mail him a letter saying that you wish to contact him. There is a document and process for doing this at the VA, I forget what it's called. JOHN (MICKEY) VANDIVER Bella Vista, AR USA - Sunday, March 28, 2004 at (EST) I served w/HHC, 4/31 from Devens through January '67 when I transferred into 8th Support - Awards and Decorations Section. -- Fred Fred Castaneda Austin, TX USA - Monday, June 30, 2003 at (EDT) Acey Robinson, Charlie company, 3rd platoon, 4th and 31st, looking for Ernie Delion, Peterson, Jack Holmes, at the reunion in Branson, MO July 2003. Joseph, MO USA - Sunday, June 29, 2003 at (EDT) As a vet of A Co. IM GOING HOME AND NEVER AGAIN DO I WANT TO FEEL ALONE. USA - Saturday, April 12, 2003 at (EDT) Came from the 4th ID in march 67 to B 4/31. Looking for people like Dave, Kenny, Joe Zunno, Paul Sweetman, Ed Anderson, Bob Blewit, Justice, Tex, and Todd. I would like to hear from anyone who remembered me. looking forward to seeing you in Branson Thomas Gimble woodbridge, va USA - Sunday, April 06, 2003 at (EDT) last night i talked with my old plt. I'm new at this please e-mail me so i can get some #s. Anyone having knowledge of his residence please contact mevia E-Mail or by telephone. i came over from the 4th infantry A company 3/21 hope to hear from somebody.... The way he wrote the story was as if he took the words out of our mouths and wrote them down of how we felt when a friend or buddy was wounded or killed. You knew who was covering it when you where in country. I'm trying to make this map/story as accurate as possible.... I remember him in his casket and he seemed so different.