And its also untrue.http://www.garnertedarmstrong. org/pubs/evolution_biglie.shtm
The strata are dated according to the fossils found in them. The fossils are dated according to the strata in which they are found. Does that sound rather arbitrary? It is.
The primary dating source for fossils is radiometric dating based on the layers of igneous rock that a sediment is sandwiched between.
The use of similar fossils as an index to date other rocks is a secondary method and not the actual source of the primary dating. However, thanks to the consistency of the fossil record, index dates have generally be found to be quite reliable. Don't take evilushinists' word for it. Oil and mineral geologists have a lot of money riding on getting their drilling right, and THEY use index fossils a lot as they have proven reliable. If the fossils indicate that a stratum is Carboniferous, then thats a bloody good indicator. Don't argue with scientists, ask the guys bank rolling billion dollar prospecting.
Junking the BS from your highly unreliable and poorly informed blog source is like shooting fish in a barrel. I suggest you find a better source. How about the actual science?