Dating of rocks fossils and geologic events answer

Eldredge and Gould certainly would agree that some very important gaps really are due to imperfections in the fossil record. For example the Cambrian strata of rocks, vintage about 600 million years, are the oldest ones in which we find most of the major invertebrate groups.And we find many of them already in an advanced state of evolution, the very first time they appear.It is as though they were just planted there, without any evolutionary history.Needless to say, this appearance of sudden planting has delighted creationists.I assigned reasons why such links do not commonly occur at the present day, under the circumstances apparently most favourable for their presence, namely on an extensive and continuous area with graduated physical conditions.I endeavoured to show, that the life of each species depends in a more important manner on the presence of other already defined organic forms, than on climate; and, therefore, that the really governing conditions of life do not graduate away quite insensibly like heat or moisture.Bold text represents the part of the passage quoted by Don Patton (my apologies to Lynx users, who may see both bold and italic text as underlined.I have not been able to find a satisfactory way of distinguishing between italicized and quoted text).

dating of rocks fossils and geologic events answer-62dating of rocks fossils and geologic events answer-50dating of rocks fossils and geologic events answer-57

It will be much more convenient to discuss this question in the chapter on the Imperfection of the geological record; and I will here only state that I believe the answer mainly lies in the record being incomparably less perfect than is generally supposed; the imperfection of the record being chiefly due to organic beings not inhabiting profound depths of the sea, and to their remains being embedded and preserved to a future age only in masses of sediment sufficiently thick and extensive to withstand an enormous amount of future degradation; and such fossiliferous masses can be accumulated only where much sediment is deposited on the shallow bed of the sea, whilst it slowly subsides.Both schools of thought despise so-called scientific creationists equally, and both agree that the major gaps are real, that they are true imperfections in the fossil record.Both schools of thought agree that the only alternative explanation of the sudden appearance of so many complex animal types in the Cambrian era is divine creation, and both would reject this alternative.— Richard Dawkins, Until recently, vertebrates have been known from rocks no older than the Middle Ordovician (about 450 million years ago) (1, 2).In 19 the known range of the vertebrates was extended back about 20 million years by discoveries of fish fossils in rocks of latest Early Ordovician and earliest Middle Ordovician age in Spitzbergen (3, 4) and Australia (5).