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Topic: Small shelly fauna

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	fauna â“ Dictionary Definition of fauna \| Encyclopedia.com: FREE Online Dictionary
		The appearance of the Pseudokoldinioidia Fauna is interpreted as contemporaneous with...
		The fauna reflects the overall land snail fauna of New Caledonia in being dominated by small snails in...
		Habitat and associated fauna of Lithophaga lithophaga (Linne 1758) in the bay of Bizerta (Tunisia).
	www.encyclopedia.com /doc/1O8-fauna.html (1176 words)

	fauna â“ Dictionary Definition of fauna \| Encyclopedia.com: FREE Online Dictionary
		The fauna is the most diverse shelly fauna yet discovered in the Lower Cambrian of Laurentia and...
		FAUNA FROM THE MEISHAN D SECTION The radiolarian fauna from this study mainly occurs in beds 11-12 of the...
		Growth of birch and pine seedlings in relation to grazing by soil fauna on ectomycorrhizal fungi.
	www.encyclopedia.com /doc/1O999-fauna.html (1226 words)

	Neoproterozoic
		A complex fauna was found in South West Africa in the 1920s but was misdated.
		At the end of the Neoproterozoic, an obscure hard-shelled fauna known as the "Small Shelly Fauna[?]" appeared.
		It is thought to be a mixture of small animal shells and fragments of segmented body armor of larger forms.
	www.ebroadcast.com.au /lookup/encyclopedia/ne/Neoproterozoic.html (451 words)

	Ediacaran Animals: Chemical Warriors?
		It is sometimes called the "small shelly fauna" period because the found fossils consist mostly of small ice-cream-cone-stack-like shells of unknown classification.
		Perhaps the small shelly fauna is what found a way to kill the Ediacarins, but Cambrian animals gave the shelly buggers a taste of their own medicine and wiped them out in turn.
		Small single cells already existed at that time, so if you simply increase your size a little bit each generation, you don't have to do anything significantly different to be big; just incremental adjustments.
	www.geocities.com /tablizer/ediacaran.htm (2645 words)

	Microbiofacies analysis of Cambrian offshore carbonates from Sardinia (Italy): environment reconstruction and ...
		The geographic (lateral) and stratigraphic (vertical) distribution of the biofacies units (bu1 to bu4) and the trophic and habitat characteristics of the fauna are fundamental to an interpretation of the depositional environment of the Campo Pisano Formation.
		Poriferans, chancelloriids, hyoliths (Microcornus), pelagiellids, and small shelly fossils (e.g.
		Although "neritic" conditions are strongly indicated by the fauna, by the lithology (Loi et alii, 1995), and by the context of syntectonic evolution (Bechstädt & Boni, 1989; Gandin et alii, 1987), absolute water depths are hard to calculate because of limited knowledge concerning rates of subsidence, sediment budgets and the range of rises in sea-level.
	paleopolis.rediris.es /cg/CG2006_A01 (10429 words)

	Small shelly fauna - Wikipedia, the free encyclopedia
		The small shelly fauna is the name given to an obscure collection of small hard-shelled fossils found worldwide in beds a bit older than the earliest trilobites and archeocyathids from the Nekamit-Daldynian and Tommotian stages (Lower Cambrian).
		Workers in a remote part of Siberia found very small hard-shelled fossils in slightly older beds in the 1980s.
		It was later recognized that the latter were fragments of body armor of a few types of animals, not complete shells of a multitude of unknown creatures.
	en.wikipedia.org /wiki/Small_shelly_fauna (417 words)

	Palaeos Paleozoic : Cambrian : Early Cambrian
		During the first 10 million years of the Cambrian Period the Tommotian fauna was replaced by a more diverse biota of larger metazoans participating in more complex communities.
		The Cambrian fauna was dominated by low-level suspension feeders such as the nonarticulate brachiopods and eocrinoids together with monoplacophoran and hyolith mollusks.
		Small shelly fossils near the base of the Cambrian mark the transition to a skeletonized fauna and the metazoan-dominated Phanerozoic fossil record.
	www.palaeos.com /Paleozoic/Cambrian/EarlyCam.html (1918 words)

	The Cambrian explosion - 'Small Shelly Fossils'
		They're small, they're shelly and they're fossils, and they are common in the Tommotian and Adtabanian stages of the lower Cambrian.
		The significance of these fossils is they mark the first appearance of skeletalized parts, albeit at a very small scale; they are also the first components of the Cambrian explosion if the Ediacara are discounted.
		Many components of the small shelly fauna cannot be allied with any modern group, and like the Ediacara, could represent anatomies that arose early and disappeared quickly.
	palaeo.gly.bris.ac.uk /Palaeofiles/Cambrian/fossils/ssf/ssf.html (141 words)

	Small Shelly Fauna
		Cloudinids are the oldest shelly animal fossils to appear abundantly in the fossil record, first appearing in the Stirling Quartzite of California (Langille 1974) and persisting into the Cambrian.
		Paraphrase: "Small shelly fossils near the base of the Cambrian mark the transition to a skeletonized fauna and the metazoan-dominated Phanerozoic fossil record.
		The recovery of articulated specimens composed of multiple sclerites discussed above, such as Wiwaxia, Halkieria and Microdictyon, suggests that much of the remaining "small shelly fauna" represent elements similarly employed as ectodermal armor in bilaterian Metazoa that have yet to be recovered in an articulated form.
	www.peripatus.gen.nz /Paleontology/SmaSheFau.html (1459 words)

	Cambrian Explosion
		Ediacaran assemblage has all but disappeared, leaving only a few, general tiny, shelly organisms, collectively known as the small shelly fauna, on stage for the next ~13 Ma: the strangely quiescent Nemakit-Daldynian Age.
		Shelly fossils become more common and more diverse in the basal Cambrian — comprising the so-called ‘small shelly fauna’ — but this radiation is modest compared to the explosive diversification of the late Early Cambrian, a phenomenon which has come to be known as the Cambrian Explosion.
		Thus, as far as anybody could be sure, the shelly fossil record was a literal record of metazoan evolution, and it seemed to be telling us that in the late Early Cambrian animals diversified explosively from almost nothing to approximately the full range of basic archetypes known today, in as little as 10 million years.
	www.peripatus.gen.nz /paleontology/CamExp.html (3079 words)

	Tommotian fauna
		The Precambrian-Cambrian transition (just prior to the Cambrian Explosion) is characterized by the appearance of small shelly fossils that are called the Tommotian fauna after the are of Siberia where they were first discovered.
		These small shelly animals were millimeters in size and represent the first appearance of diverse skeletal material in the fossil record, some 10 million years before the first trilobites appear in the fossil record.
		This fauna that existed some 530 million years ago is of essential evolutionary importance in that these oldest known metazoans (animals) had mineralized (skeletal) hard parts, and thus are the probable ascendants to the many phyla of the Cambrian Explosion.
	www.fossilmuseum.net /Paleobiology/Tommotian_fauna.htm (239 words)

	gould
		This forced the progenitors of the mammals into a situation where their evolutionary rate was high (mice and rats differ by 30% in their DNA while humans and chimps differ only by 2%) and the constraints pushed their brains and body plans to an optimally efficient and adaptable state of generalization.
		The first fauna, called Ediacaran to honor the Australian locality of it initial discovery but now known fro rocks on all continents, consists of ly flattened fronds, sheets and circlet composed of numerous slender se ments quilted together.
		Small size may not have been positive mammalian adaptation at but more a sign of inability ever to penetrate the dominant domain of dinosaurs.
	www.dhushara.com /book/evol/gould.htm (4981 words)

	The Evolution of Life on Earth by Stephen J. Gould
		At higher levels, involving entire species or faunas, punctuated equilibrium can produce evolutionary trends by selection of species based on their rates of origin and extirpation, whereas mass extinctions wipe out substantial parts of biotas for reasons unrelated to adaptive struggles of constituent species in "normal" times between such events.
		The first fauna, called Ediacaran to honor the Australian locality of its initial discovery but now known from rocks on all continents, consists of highly flattened fronds, sheets and circlets composed of numerous slender segments quilted together.
		Small size may not have been a positive mammalian adaptation at all, but more a sign of inability ever to penetrate the dominant domain of dinosaurs.
	www.xs4all.nl /~sas2/cacdba/gould.html (4768 words)

	Paleozoic
		Scientists still don't know if these "small shelly fossils", as they call them, are little pieces and bits of bigger organisms or main parts of small animals.
		Small shelly fauna had spread over the whole Earth, but after 10 million years it began to disappear.
		He classified Burgess fauna among the younger fossil and contemporary groups of animals, but they didn't stayed there.
	library.thinkquest.org /22446/Paleozoic.html (1719 words)

	EnNPpubs2003
		Small shelly fauna from the late Early Cambrian Bastion and Ella Island Formations, North-East Greenland Journal of Paleontology 80, 1087-1112.
		Small shelly fossils from the basal Emigrant Formation (Cambrian, uppermost Dyeran Stage) of Split Mountain, Nevada Canadian Journal of Earth Science 2006; 43(487-496).
		A new mobergellan (small shelly fossils) from the Middle Cambrian of Morocco and its significance Paläontologische Zeitschrift 2006; 80(3):209-220.
	www.palaeontology.geo.uu.se /Publications/Pubs2006.html (761 words)

	Gould: The Evolution of Life on the Earth
		At higher levels, involving entire species or faunas, punctuated equilibrium can produce evolutionary trends by selection of species based on their rates of origin and extirpation, whereas mass extinctions wipe out substantial parts of biotas for reasons unrelated to adaptive struggles of constituent species in "normal" times between such events.
		The first fauna, called Ediacaran to honor the Australian locality of its initial discovery but now known from rocks on all continents, consists of highly flattened fronds, sheets and circlets composed of numerous slender segments quilted together.
		As one plausible argument, mammals may have survived partly as a result of their small size (with much larger, and therefore extinction- resistant, populations as a consequence, and less ecological specialization with more places to hide, so to speak).
	www.brembs.net /gould.html (4834 words)

	J34 The Cambrian explosion
		Traditionally the "Cambrian explosion" was the sudden appearance in the Lower Cambrian (Atdabanian stage) 520-525 million years ago of a diverse and widely occurring skeletal animals, predominately trilobites and brachiopods, sometimes in association with archaeocyathids that were the first skeletal reef (calcareous bioherm and biostrome) builders.
		Referred to in the literature as the SSF (small shelly fauna), are shed, or disarticulated, tiny calcareous spines, studs and plates.
		Before trilobites appeared as the ubiquitous and visible, because of their mineralized skeletons, metazoan fossils, which inspired the designation "Cambrian explosion," earlier Cambrian fauna of tiny shelly forms (and no trilobites) were in existence.
	geowords.com /histbooknetscape/j34.htm (882 words)

	Phanerozoic
		Most geologists and paleontologists would probably set the PreCambrian-Phanerozoic boundary either at the classic point where the first trilobites and archeocyathids[?] appear; at the first appearance of a complex feeding burrow called Phycodes pedum; or at the first appearance of a group of small, generally disarticulated, armored forms termed 'the small, shelly fauna'.
		The time span of the Phanerozoic includes the rapid emergence of a number of animal phyla; the evolution of these phyla into diverse forms; the emergence of plants onto land; the development of complex plants; the evolution of fish; the emergence of animals onto land; and the development of modern faunas.
		During the period covered, continents drifted about, eventually collected into a single landmass known as Pangea and then split up into the current six continental landmasses.
	www.ebroadcast.com.au /lookup/encyclopedia/ph/Phanerozoic.html (286 words)

	Untitled
		All this changed with the discovery of a soft-bodied fauna in the Ediacarian Hills of South Australia.
		SSFs appear sequentially and diversify through a period of some 3-6 m.y.
		small, chitinous, calcareous, and phosphatic metazoans of problematic affinity
	www.clas.ufl.edu /users/pciesiel/gly3603c/ediacarian.html (344 words)

	Science: The biggest mass extinction of them all? - 01 August 1992 - New Scientist
		In the Tommotian stage of the early Cambrian small animals with shells appeared.
		Palaeontologists were aware that the small shelly fauna and the archaeo-cyathids died out towards the end of the early Cambrian.
		The Botomian extinction severely affected the small shelly fauna and the archaeocyathids.
	www.newscientist.com /article/mg13518322.900-science-the-biggest-mass-extinction-of-them-all-.html (678 words)

	Life of the Paleozoic Era
		The "Cambrian fauna" typified the Cambrian oceans; although members of most phyla were present during the Cambrian, the seas were dominated by trilobites, inarticulate brachiopods, monoplacophoran molluscs, hyolithids, "small shelly fossils" of uncertain systematic posiiton, and archaeocyathids.
		The early tetrapods of this time were amphibian-like animals that eventually gave rise to the reptiles and synapsids by the end of the Paleozoic.
		One of the earliest terrestrial tetrapod faunas known in the world is from Joggins, Nova Scotia.
	www.ucmp.berkeley.edu /paleozoic/paleozoiclife.html (262 words)

	My Collection - Cambrian
		A unique insight into the early cambrian faunas is offered by famous fossil sites like the Burgess Shale in Canada and several sites in China, where completely preserved specimens are abundantly found together with imprints or remains of their soft parts.
		The Lower Cambrian fauna is so characteristic that it's usually referred to as "small shelly fauna" and is used to define the Cambrian's only stage, the Tommotian.
		According to newer research results, the sudden appearance of shelly organisms derives from a critical oxygen level in the earth's atmosphere (approx.
	www.palaeo-online.de /e/sammlung/cambrian.html (380 words)

	The Bible and Paleontology
		The fossils are very small, a millimeter or less in diameter is typical, and consist at first of cones, tubes, spines and plates of unknown affinities.
		One of these, put forth by Daniel Axelrod, proposed that the plants were evolving in "upland floras" away from the regions where fossils were being preserved, and thus we have no fossil record of their evolution.
		These rocks contain the remains of a fauna dominated by mammals, and record a flora that appears to transition from the geographically widespread angiosperm-dominated floras represented in the Upper Cretaceous to the plants specific to the various regions on the earth today.
	origins.swau.edu /papers/dinos/paleo/eng/index.html (10910 words)

	Trilobite biostratigraphy
		It was not until the 20th century, however, that the study of radioactive decay allowed scientists to date rocks via their isotope proportions, finally giving absolute ages to the relative ages of the geological time scale.
		It points out that the very earliest Cambrian is without trilobites, and the zonations use instead trace fossils and small shelly fossils (so called because we still don't have a clear idea of what the small shells were part of).
		The discovery of fossils of undetermined affinity in strata lower than trilobites (the "small shelly fossils" fauna) extended the Cambrian lower than it was previously set, and this pre-trilobite series is now considered the lowest Cambrian.
	www.trilobites.info /biostratigraphy.htm (1900 words)

	Evolution: Library: The Cambrian Explosion
		First, there was the rise and fall of mysterious creatures of the Ediacaran fauna, named for the fossil site in Australia where they were first discovered.
		First, organisms may not have sequestered and secreted much in the way of fossilizable hard parts; and second, the environments in which they lived may have characteristically dissolved those hard parts after death and recycled them.
		An exception was the mysterious "small shelly fauna" -- minute shelled animals that are hard to categorize -- that left abundant fossils in the early Cambrian.
	www.pbs.org /wgbh/evolution/library/03/4/l_034_02.html (824 words)

	Pharyngula::A signature of a radiation in metazoan evolution
		The major groups of animals separated 600 or perhaps even as much as 700 million years ago, flourished as small wormlike forms that would have fossilized poorly, and what the Cambrian represents is an emergence of larger forms with hard body parts that fossilized well.
		shelly fossils is sudden, wide-spread, and remains an enigma.
		From cream-colored sediments of what was a sea floor 570 million years ago, paleontologists have extracted specimens of 70 species of trilobites, worms, sponges and various ancestors of crustaceans, spiders and insects.
	pharyngula.org /index/weblog/comments/radiation_signature (5461 words)

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