The nature of the stratigraphical record review Û 103

download Û eBook or Kindle ePUB ½ Join or create book clubs

The nature of the stratigraphical recordShows is genius and it really helps me connect with the sto. NOTE This review pertains to the 101 page 1972 editionDerek Victor Ager 1923 1993 was a British paleontologist He wrote in the Preface to this 1972 1st edition book “This is not a textbook or a research treatise It is I like to think an ‘ideas book’ It is a commentary on the general pattern of earth history which I hope will be stimulating if perhaps provocatively so to all those concerned with geology as a whole rather than as a loose agglomeration of separated specialties It seems to me that the conclusions contained in this book are inescapable if one is not too involved in the minutiae of stratigraphical correlation actually to see them No doubt I shall be criticized for some of my generalizations but I am unrepentant“I have tried to use examples which I have seen for myself and which have impressed me The one great hope I have for this book is that it will stimulate thought and argument even rage I think our science would be a lot healthier if we took less for granted It may be said that I do not relate my thoughts sufficiently to all the exciting new ideas of sea floor spreading and plate tectonics But really these ideas do not help very much My stratigraphical enigmas remain the same wherever the plates are sailing round the earth At times I almost feel willing to put the blame on flying saucers than on floating plates”He notes “We know that the fossil record is fragmentary in the extreme Yet it is the common experience of most paleontologists that just as lithological facies are persistent around the world so are the fossils which they contain Theoretically we might expect this to be so since the same environment tends to support the same kinds of organisms but in fact the persistence of some fossils appears to go far beyond what we know at the present day” Pg 15He observes “we have fossils that just suddenly appear around the world at one moment in geological history One can understand this perhaps in the fragmentary record of a rare and little known group but the Mesozoic brachiopods are now very thoroughly documented in every stage and distinctive forms can hardly have been missed one is struck ; by the remarkable way in which particular groups of fossils seem to have been ‘in fashion’ for a while and then return to a comparatively minor role” Pg 16 17He points out “What do we mean by ‘continuous ssedimentation’ Do we mean something like one sand grain ever suare meter of sea floor per minute per day per year Even the least of these would give us vastly sediment than we normally seem to find preserved for us in our stratigraphical record When attempts have been made to calculate rates of sedimentation in what look like continuously deposited sediments the results look ridiculous A very conservative estimate for the Upper Cretaceous Chalk would give about 30 million years for its deposition That works out as nearly a thousandth of a foot per hear or two hundred years to bury a Micraster And that is for the most rapidly accumulating chalk” Pg 27He ends each chapter with a summary proposition “At certain times in earth history particular types of sedimentary environment were prevalent over vast areas of the earth’s surface This may be called the ‘Phenomenon of the Persistence of Facies’” Pg 13 “Paleontologists cannot live by uniformitarianism alone This may be termed the ‘Phenomenon of the Fallibility of the Fossil Record’” Pg 26 “The sedimentary file at any one place on the earth’s surface is nothing than a tiny and fragmentary record of vast periods of earth history This may be called the ‘Phenomenon of the Gap Being More Important than the Record’” Pg 34 “Sedimentation in the past has often been very rapid indeed and very spasmodic This may be called the ‘Phenomenon of the Catastrophic Nature of much of the Stratigraphical Record’” Pg 42 “Most sedimentation in the continental areas is lateral rather than vertical and is not necessarily connected with subsidence This may be called the ‘Principle of the Relative Independence and Sedimentation and Subsidence’” Pg 59 “Let us make an arbitrary decision to define the base of every stratigraphical unit in a selected section This may be called the ‘Principle of the golden spike’” Pg 73He states “energy is expended in near shore sedimentary environments within short time intervals that are separated by long periods of relative calm In other words the changes do not take place gradually but as sporadic bursts as a series of minor catastrophes the rare hurricane is likely to be the main agent recorded in the stratigraphical column of certain parts of the world even in our present climatic set up” Pg 44 45 Later he adds “The hurricane the flood or the tsunami may do in an hour or a day than the ordinary processes of nature have achieved in a thousand years Given all the millennia we have to play with in the stratigraphical record we can expect our periodical catastrophes to do all the word we want of them” Pg 49He ends “The final conclusion I come to therefore is that though the theories of plate tectonics now provide us with a modus operandi they still seem to me to be a periodic phenomenon Nothing is world wide but everything is episodic In other words the history of any one part of the earth like the life of a soldier consists of long periods of boredom and short periods of terror” Pg 100This provocative book favorably uoted by Stephen Jay Gould as well as by creationists and fans of Velikovsky will be “must reading” for those interested in creative ideas in science

Join or create book clubs ½ 3 review

L record author Join or create book clubs The way the author. What I like in this old classic book is its small format which makes it very easy to carry aroundthe intense reading and right pace of the narrative I think this book should be republished in exactly the same form or perhaps adding some pictures or putting them widespread in the text Oh yes it's a must read for all undergrad geologists by the way

read & download The nature of the stratigraphical record

The nature of the stratigraphical record review Û 103 Ü [PDF / Epub] ✅ The nature of the stratigraphical record Author Join or create book clubs – Best E Book, The nature of the stratigraphical record author Join or create book clubs The way the author shows is genius and it really helps me connect wBest EBook The nature of the of the Epub #218 stratigraphica. The book is now classic Very well written by one of the leading sedimentary geologists If you are professional geologist or geology educator it's a must for your library For the rest of the world only if you are interested in sedimentary geology Are you