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Results tagged with stratigraphy
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user 87
Stratigraphy is the study of rock strata and their intrepretation in term of absolute or relative age.
0
votes
How was the onset of the Cambrian period dated?
Just to give some complementary informations from the other answer: the base of the Fortunian is indeed defined in eastern Canada on the basis of a trace fossil (which obviously cannot be itself dated …
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2
votes
What makes pollen varieties useful index fossils?
In addition to what @GordonStanger said, there are a few other points to consider.
Pollens and spores are made out of sporopollenin which preserves way better than what one would expect.
Although th …
CommunityBot
- 1
15
votes
Accepted
Why is the concept of "mass extinction" a relatively recent development in geology?
evolved in par with the evolution of stratigraphic tools, and the 1970-1980s is the period during which high-resolution stratigraphic methods arose (chronostratigraphy, magnetostratigraphy, stable isotope stratigraphy …
- 5,348
3
votes
Database of geological group or formation exposures?
Macrostrat is (or in fact will be) what you are looking for I think.
This database is still in development and is apparently only available through the website as a beta so far. It only seems to cover …
- 5,348
5
votes
Nuclear testing and the Anthropocene, a chemostratigraphic link?
The chapter on the Anthropocene (Zalasiewicz et al., 2012) of "The Geological Timescale 2012" quote 3 papers that used artificial radionucleotides as stratigraphic markers: Schwikowski (2004), Turetsk …
- 5,348
9
votes
Accepted
Is the Principle of Fossil Succession accurate?
Your analogy with burying a box is not as accurate as you think. It needs specific sedimentary conditions for the remains of an organism to fossilize: being buried in soil is far from enough.
Fossili …
- 11k
8
votes
Determining a rock age using volcanic ash layer
The main interest of tephrochronology (i.e. dating sediments using volcanic ash layer) is specifically its instantaneity (relatively to geological timescale of course). It is precisely used for higher …
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