Job 33:6
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- Jun 15, 2017
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Yeah Geologically the bottom section is older, but I'm talking about the fossils in each layer which get dated to the layer and seen as beginning to exist in that layer. So if the land animals that later walked onto that plot of land existed even when the land was under water they will only show up in the geologically later section of land giving the impression of speciation even know they existed since the first section. (Just not in this piece of land) How do we know we're not just dealing with the fact that land animals and plants aren't going to be in a place that's underwater to lay down fossils.
Speciation is defined, morphologically, not really temporally or by what strata the fossil is found in. We consider the upper layer fossils a new species because they morphologically are different.
Identifying speciation in fossils is a lot more complicated than identifying species in the modern world though. Some fossils such as anomalocaris was originally identified as 3-4 independent species of jellyfish and shrimp, before we realized they were all small parts of a single animal. And sometimes people cant tell the difference between juvenile fossils and adults. Some baby fossils have large heads, like people. But in other cases, its not as clear. So sometimes there are controversies over what is a new species versus what is the same species represented by 2 different age groups, thus is the case with ah...what is it...triceratops and torosaurus.
https://en.wikipedia.org/wiki/Anomalocaris
Anomalocaris has been misidentified several times, in part due to its makeup of a mixture of mineralized and unmineralized body parts; the mouth and feeding appendage was considerably harder and more easily fossilizedthan the delicate body.[9] Its name originates from a description of a detached 'arm', described by Joseph Frederick Whiteaves in 1892 as a separate crustacean-like creature due to its resemblance to the tail of a lobster or shrimp.[9] The first fossilized anomalocaridid mouth was discovered by Charles Doolittle Walcott, who mistook it for a jellyfish and placed it in the genus Peytoia. Walcott also discovered a second feeding appendage, but failed to realize the similarities to Whiteaves' discovery and instead identified it as feeding appendage or tail of the extinct Sidneyia.[9] The body was discovered separately and classified as a sponge in the genus Laggania; a mouth was found with the body, but was interpreted by its discoverer Simon Conway Morris as an unrelated Peytoia that had through happenstance settled and been preserved with Laggania. Later, while clearing what he thought was an unrelated specimen, Harry B. Whittington removed a layer of covering stone to discover the unequivocally connected arm thought to be a shrimp tail and mouth thought to be a jellyfish.[9][2] Whittington linked the two species, but it took several more years for researchers to realize that the continuously juxtaposed Peytoia, Laggania and feeding appendage actually represented a single, enormous creature.[9] Because Peytoia was named first, it became the correct name for the entire animal. The original feeding arm, however, came from a larger species distinct from Peytoia and "Laggania", which retains the name Anomalocaris.[11]
https://en.wikipedia.org/wiki/Torosaurus
Recently the validity of Torosaurus has been disputed.[5] A 2010 study of fossil bone histology combined with an investigation of frill shape concluded that Torosaurus probably represented the mature form of Triceratops, with the bones of typical Triceratops specimens still immature and showing signs of a first development of distinct Torosaurus frill holes. During maturation, the skull frill would have been greatly lengthened and holes would have appeared in it.[6][7][8] In 2011, 2012 and 2013 however, studies of external features of known specimens have claimed that morphological differences between the two genera preclude their synonymy. The main problems are a lack of good transitional forms, the apparent existence of authentic Torosaurus subadults, different skull proportions independent of maturation and the assertion that hole formation at an adult stage is not part of a normal ceratopsian maturation sequence.[4][9][10]
But dont be fooled by young earthers. The fossil record strongly supports the theory of evolution. But of course nothing in science is perfect, its always an ongoing practice of research and discovery
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