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Evidence for extinction selectivity throughout the marine invertebrate fossil record
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Abstract.-The fossil record has been used to show that in some geologic intervals certain traits of taxa may increase their survivability, and therefore that the risk of extinction is not randomly distributed among taxa. It has also been suggested that traits that buffer against extinction in background times do not confer the same resistance during mass extinction events. An open question is whether at any time in geologic history extinction probabilities were randomly distributed among taxa. Here we use a method for detecting random extinction to demonstrate that during both background and ...
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Carbonate Concretions Part 2.(Brief Article)(Statistical Data Included)
Magazine article from: Rocks & Minerals
; ...reviewing the literature about carbonate concretions? (From two former students, Daniel...Chips column.) ANSWER: Carbonate concretions are of great interest and importance...Disclaimers, Definitions, Genesis, Concretions as Rocks, Concretions as Hosts of Minerals...
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Carbonate Concretions Part 1.
Magazine article from: Rocks & Minerals
; ...Early use of the term concretion was apparently restricted...biochemically developed concretions such as calculi in...order to distinguish concretions from clastic masses...have used the terms concretion and nodule interchangeably. Furthermore, concretions have been designated...
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Chemical and mineralogical composition of Fe-Mn concretions and calcretes occurring in sodic soils of Eastern Uttar Pradesh, India.(Iron-Manganese)(Statistical Data Included)
Magazine article from: Australian Journal of Soil Research
; ...Gangetic alluvium frequently have concretions (Sidhu et al. 1978) associated with...compositions of iron-manganese (Fe-Mn) concretions in soils of the north-western parts...composition, and mineralogy of calcretes and concretions in 4 sodic soils representative of Mirzapur...
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Profile: Tiny mineral balls found on Mars, known as concretions or blueberries, are similar to those found in southern Utah
Transcript from: NPR All Things Considered
; ...comes from iron oxides inside something called concretions. Ms. BEITLER: A concretion is just a localized mass that accumulates in...kind of cement blob, a concretion. Finding concretions is a clear sign water was once around. Concretions...
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Sandstone-hosted concretions record evidence for syn-lithification seismicity, cavitation processes, and Palaeocene rapid burial of Lower Cretaceous deep-marine sandstones (Outer Moray Firth, UK North Sea)
Magazine article from: Journal of the Geological Society
; ...are abundant in concretions formed during shallow...confined to the concretion bodies, but commonly...occurred as host concretions lithified. Expulsion...protrusions at concretion margins. A hydraulic...lithification of the concretions had dramatically...remained in the concretion ...
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Palaeobiology meets geochemistry: Concretions as tombs
Magazine article from: Journal of the Geological Society
; ...meeting. New fossiliferous concretions continue to be found, even...Lagerstatte from Herefordshire in concretions within a Silurian volcaniclastic...The authors show that early concretion growth prevented collapse...Huggett et al. They report on concretions from the Palaeogene London...
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Three-dimensional preservation of a non-biomineralized arthropod in concretions in Silurian volcaniclastic rocks from Herefordshire, England
Magazine article from: Journal of the Geological Society
; ...arthropod occurs in carbonate concretions in a volcaniclastic deposit...Incorporation of the fossils into concretions ensured their long term preservation...and in the matrix of the concretion occurred at a later stage...arthropods, preservation, concretions. The arthropod specimens...
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What in the world is it?(concretions from the Whydah Museum)
Magazine article from: Odyssey
; ...on the Whydah's bell. It's a concretion, a concrete like material created...ILLUSTRATION OMITTED] As long as a concretion is intact and kept wet, the artifact is protected. To keep a concretion from drying out and randomly breaking...
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Ohio mineral locality index: part 2: concretions and miscellaneous occurrences.
Magazine article from: Rocks & Minerals
; ...sites. OCCURRENCES Concretions, Nodules, and Septaria Concretion is a general term...enclosing strata. A concretion typically is a flattened...nodule is a type of concretion with a rough and knobby surface. Concretions are commonly concentrated...
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 "Star Tribune (Minneapolis, MN)")
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Concretions are `rocks with a soul'.(TRAVEL)
Newspaper article from: Star Tribune (Minneapolis, MN)
; ...rock formations, known as concretions, along the south shore of...test in rock, the joy of concretions lies in perception. Some...football players." The term "concretion" comes from the Latin con...Glacial Lake of Duluth. Concretions remain something of a mystery...
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