Okay, sorry for the misunderstanding, I see you want something very precise and that is quite difficult to do as there are several independent factors that can vary definitions. I guess the best I can do with that is to pull out one of my old Paleontology textbooks and use their basic definition. It says Biologists use two definitions or concepts to recognize species: one based primarily on morphology--form, size and proportions--and the other based on distribution and potential for interbreeding. It then goes on for several pages spelling out the particulars. With respect to paleontology, i.e. fossils; they say "A paleontologist must often decide whether a collection of fossils contains only a single species of a particular genus, or two or more species". And it continues with quite a bit of elaboration on that. I guess my point is that there is not one standard specific definition.
Having said that, species or even genera have nothing to do with what I am asking for in the thread. I gather you may be gravitating toward what constitutes a transitional fossil. If that is the case, transitional fossils are completely irrelevant for what is being asked in the OP. The thread is not how life evolves or evolved. The point of the thread is; how did the fossils we find in sedimentary strata get there? If not by evolution, what 'scientific' principle and/or evidence shows something different. Thus, if nothing evolved, should we not find fossils of all life forms in all layers of sedimentary strata? The fact is we do not, so how did they get there?