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Quoting nielsen <[log in to unmask]>:
> in practice I think it is still useful.
> Otherwise, how do you differentiate if a type species is a living or a
> fossil one? If the type species is, say, Miocene or what? Holocene? It
> wouldn't do it justice, I think.
* remember that the "-cene" in the names of the epochs refers to the
percentage of living Mollusc species in the fossil record "The Miocene
was named by Sir Charles Lyell... from the Greek words meiōn
(“less”) and kainos (“new”) and means "less recent" because it has 18%
fewer modern sea invertebrates than the Pliocene." - wikipedia
fred.
===================================================
> Am 2014-01-06 18:25, schrieb Powell, Charles:
>> Sevn,
>>
>> I think your mixing up two different things. ? Extant and extinct
>> refer to if an animal or plant is still living today or not.
>> ? Holocene, Pleistocene, Pliocene, etc are ages, periods of time in
>> the past. ? Animals can be living today and range back in time to the
>> Pliocene or older (the are still extant), while a few known from the
>> Holocene, from within a few hundred years of present are still
>> extinct
>> because there are no representatives of the species still alive. ? One
>> set of terms is completely different from the other and they
>> describes
>> different things. ?
>>
--
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Frederick W. Schueler & Aleta Karstad
Bishops Mills Natural History Centre - http://pinicola.ca/bmnhc.htm
Mudpuppy Night in Oxford Mills - http://pinicola.ca/mudpup1.htm
Daily Paintings - http://karstaddailypaintings.blogspot.com/
South Nation Basin Art & Science Book
http://pinicola.ca/books/SNR_book.htm
RR#2 Bishops Mills, Ontario, Canada K0G 1T0
on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
(613)258-3107 <bckcdb at istar.ca> http://pinicola.ca/
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