real lifeQuote: I submit to you that there is no naturalistic mechanism that can account for so many incredibly diverse and complex animal forms, body plans, organs, systems etc to appear in such a short amount of time.
. I see, and youve established this how?. A bit of trick photography, before the beginning of the Cambrian, Parvincorina and Charnodiscus bore a great similarity to trilobites and notochords.
This argument f yours is an effort to establish some authority when you havent a clue of what you speak. Just because youve read it in AIG doesnt meana thing. If you nderstand the time period and the conditions that existed, youd understand that planetary global tectonics had, at the end of the pre Cambrian established Gondwana with evdences of large isolated inland seas, in which are evidenced many different "first time" species (Many of which were evolutionary dead ends).
Your wording is selective and quite scholarly, have you actually seen these "complex lifeforms and examined their complexity" I have , and there is no way that one can establish the internals of a trilobite from a fossil all this is done by inferences from external body parts (Fortey 2000) sndd we have plenty of pre CAmbrian legs and eyes and feelers etc in the record
Might I suggest a deeper inquiry into Narbonne and Gehling (2003) and Seilacher (1992) before you try to advance an argument from authority.
Landing (1989) had produced a good discussion of the development of "Hardshell life" at the Cambrian base, and it has nothing to do with "miracles"
Pre Cambrian life ws abundant and of a kind that could serve as progenitors of the later bauplans(legs and eyes and other "complex " parts). The Cambrian explosion was, in fact, a dispersion of fossils with hard parts and include sponges with hard spicules, brachiopods (with clearly identifiable striae) artnropods, including trilobites and echinoids.
All these appearances occur in sediments that have no unconformities or bioturbation or turbidity currents (Zhuravlev 2001) This indicates a complete "quiet time" with an absence of changing sea levels or glaciation.However, the transistion of the above animals from arthropods with few hard parts (Tribrachidium) to hard parts (olenellus) seems to be a function of the tectonic conditions worldwide (most of the world was in a temperate tropical mix and free Oxygen was at an all time high, no meteoric impacts etc. so going from a suspected pre cambrian arthropod tribrachidium, to a basal CAmbrian trilobite olenellus, isnt such a grand leap requiring intervention. (the fact that were even talking about these deep time ages means that you are no longer a "Young earther" neh?)
The summary of Zhuravlev is that at the basal Cambrian, the orders were already all there , they merely began to develop shells in the 7 to 10 million year period that you are questioning.
If you want a miracle, the animals that crossed the precambrian/Cambrian line were mostly already there so your miracle only involves exoskeletal hard parts. The reamaining orders of animals and plants had to wait through the rest of thePaleozoic to show up. So, once again, your appeal to "Its a mystery" isnt as appealing.
In truth we dont understand why then and not earlier did the fossils evidence more shelly material, perhaps the early "hard part" creatures used a chitinous rather than calcareous shell and , of these , only the arthropods retained that mechanism. Since life appears in a sequence that has been interpreted by stratigraphic and dating techniques, we do see the entire progression of life from the Vendean through the Pleistocene included only about 14% of the total time that the planet was here. 86% of the earlier time (preVendean0 we only have some indications of protists, cyano bacter stromatolite biostrome reefs, archeobacter and an early indicator at abou 3.8 BY BP from Greenland in which carbon isotopes of the C12 variety indicate life in a carbonaceous shale. But Ive been generous and said that well start with the Vendean even though we know that there were single celled and colonial life-forms prior, the Vendean contains all the biggy deposits of the Placentia,Burin, Ediacaran , and the multi African sites near Botswana .
Your pronouncement that this cannot have occured naturally isnt consistent with all the facts.Yours is a religious "wish" not an evidence borne conclusion. So, unless you pose some real hard evidence of your sides thinking , (other than our secret pal), Ill continue to practise my craft without a quick submission to GSA or Geotimes that " weve just found out that our previous models are all incorrect"
