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- Small_shelly_fauna abstract "The small shelly fauna or small shelly fossils, abbreviated to SSF, are mineralized fossils, many only a few millimetres long, with a nearly continuous record from the latest stages of the Ediacaran to the end of the Early Cambrian period. They are very diverse, and there is no formal definition of "small shelly fauna" or "small shelly fossils". Almost all are from earlier rocks than more familiar fossils such as trilobites. Since most SSFs were preserved by being covered quickly with phosphate and this method of preservation is mainly limited to the Late Ediacaran and Early Cambrian periods, the animals that made them may actually have arisen earlier and persisted after this time span.Some of the fossils represent the entire skeletons of small organisms, including the mysterious Cloudina and some snail-like molluscs. However, the bulk of the fossils are fragments or disarticulated remains of larger organisms, including sponges, molluscs, slug-like halkieriids, brachiopods, echinoderms, and onychophoran-like organisms that may have been close to the ancestors of arthropods.One of the early explanations for the appearance of the SSFs – and therefore the evolution of mineralized skeletons – suggested a sudden increase in the ocean's concentration of calcium. However, many SSFs are constructed of other minerals, such as silica. Because the first SSFs appear around the same time as organisms first started burrowing to avoid predation, it is more likely that they represent early steps in an evolutionary arms race between predators and increasingly well-defended prey. On the other hand mineralized skeletons may have evolved simply because they are stronger and cheaper to produce than all-organic skeletons like those of insects. Nevertheless it is still true that the animals used minerals that were most easily accessible.Although the small size and often fragmentary nature of SSFs makes it difficult to identify and classify them, they provide very important evidence for how the main groups of marine invertebrates evolved, and particularly for the pace and pattern of evolution in the Cambrian explosion. Besides including the earliest known representatives of some modern phyla, they have the great advantage of presenting a nearly continuous record of Early Cambrian organisms whose bodies include hard parts.".
- Small_shelly_fauna wikiPageExternalLink 1jtommo.html.
- Small_shelly_fauna wikiPageExternalLink SmaSheFau.html.
- Small_shelly_fauna wikiPageExternalLink CamExp.html.
- Small_shelly_fauna wikiPageID "18952041".
- Small_shelly_fauna wikiPageRevisionID "597233581".
- Small_shelly_fauna caption "Stem groups.".
- Small_shelly_fauna hasPhotoCollection Small_shelly_fauna.
- Small_shelly_fauna height "180".
- Small_shelly_fauna imageLeft "0".
- Small_shelly_fauna imageTop "0".
- Small_shelly_fauna imageWidth "200".
- Small_shelly_fauna width "200".
- Small_shelly_fauna subject Category:Cambrian.
- Small_shelly_fauna subject Category:Ediacaran_biota.
- Small_shelly_fauna subject Category:Fossils.
- Small_shelly_fauna subject Category:Index_fossils.
- Small_shelly_fauna subject Category:Paleontology.
- Small_shelly_fauna type Adult109605289.
- Small_shelly_fauna type CausalAgent100007347.
- Small_shelly_fauna type Dodo110022908.
- Small_shelly_fauna type Fossils.
- Small_shelly_fauna type LivingThing100004258.
- Small_shelly_fauna type Object100002684.
- Small_shelly_fauna type Oldster110376523.
- Small_shelly_fauna type Organism100004475.
- Small_shelly_fauna type Person100007846.
- Small_shelly_fauna type PhysicalEntity100001930.
- Small_shelly_fauna type Whole100003553.
- Small_shelly_fauna type YagoLegalActor.
- Small_shelly_fauna type YagoLegalActorGeo.
- Small_shelly_fauna comment "The small shelly fauna or small shelly fossils, abbreviated to SSF, are mineralized fossils, many only a few millimetres long, with a nearly continuous record from the latest stages of the Ediacaran to the end of the Early Cambrian period. They are very diverse, and there is no formal definition of "small shelly fauna" or "small shelly fossils". Almost all are from earlier rocks than more familiar fossils such as trilobites.".
- Small_shelly_fauna label "Fauna tomotiana".
- Small_shelly_fauna label "Pequeños fósiles con concha".
- Small_shelly_fauna label "Piccola fauna dura".
- Small_shelly_fauna label "Small shelly fauna".
- Small_shelly_fauna label "Small-Shelly-Fauna".
- Small_shelly_fauna label "微小硬骨格化石群".
- Small_shelly_fauna sameAs Small-Shelly-Fauna.
- Small_shelly_fauna sameAs Pequeños_fósiles_con_concha.
- Small_shelly_fauna sameAs Piccola_fauna_dura.
- Small_shelly_fauna sameAs 微小硬骨格化石群.
- Small_shelly_fauna sameAs Fauna_tomotiana.
- Small_shelly_fauna sameAs m.0dyws.
- Small_shelly_fauna sameAs Q1058746.
- Small_shelly_fauna sameAs Q1058746.
- Small_shelly_fauna sameAs Small_shelly_fauna.
- Small_shelly_fauna wasDerivedFrom Small_shelly_fauna?oldid=597233581.
- Small_shelly_fauna isPrimaryTopicOf Small_shelly_fauna.