Moved to "Science" forum.
Secondly, fossils do not always form when an animal dies. Having a hard structure (shell / bones) is a good indicator that fossils will form though, and it just so happens that the Cambrian "explosion" was when these creatures first evolved. The reason why we don't have "rich fossilferous deposits" is because there were hardly any animals which would fossilize in the pre-cambrian. However there are some pre-cambrian fossils: http://www.fossilmuseum.net/Paleobiology...ossils.htm
(May 19, 2009 at 11:05 pm)icthus Wrote: Here is my question-- In the earth's crust are many layers of strata,the lowest level of strata that scientists have found with fossil remains is the Cambrian Strata. The fossil remains in this strata compare to todays animals. If evolution is genuine-where are their ancestors???-Firstly, I'd like to see you identify which of these fossils compare to today's animals. Granted, there are some that bear a strange resemblance, but this only backs up evolutionary theory (it's actually a prediction of it). Evolution doesn't mean that creatures will change, but that given the correct circumstances and a change in environment, they won't just die out, but adapt to survive. The Coelacanth is a good example of a fish that is alive today, and which we have fossils of dating back many millions of years ago.
Secondly, fossils do not always form when an animal dies. Having a hard structure (shell / bones) is a good indicator that fossils will form though, and it just so happens that the Cambrian "explosion" was when these creatures first evolved. The reason why we don't have "rich fossilferous deposits" is because there were hardly any animals which would fossilize in the pre-cambrian. However there are some pre-cambrian fossils: http://www.fossilmuseum.net/Paleobiology...ossils.htm