Paleontology is a study of prehistoric life.
Paleontology is a large subject due to the inclusion of fossils from the rock record, taxonomic classification of these fossils, and the occasional find of residual organic material that sometimes contains genetic material.
- 1 Theoretical paleontology
- 2 Fossils
- 3 Micropaleontology
- 4 Paleobotany
- 5 Palynology
- 6 Invertebrate paleontology
- 7 Vertebrate paleontology
- 8 Geologic time
- 9 Paleoecology
- 10 Paleoclimatology
- 11 Holocene
- 12 Pleistocene
- 13 Pliocene
- 14 Miocene
- 15 Oligocene
- 16 Eocene
- 17 Paleocene
- 18 Cenozoic
- 19 Cretaceous
- 20 Jurassic
- 21 Aalenian
- 22 Hettangian
- 23 Triassic
- 24 Ladinian
- 25 Anisian
- 26 Olenekian
- 27 Induan
- 28 Mesozoic
- 29 Permian
- 30 Carboniferous
- 31 Devonian
- 32 Silurian
- 33 Upper Ordovician
- 34 Sandbian
- 35 Middle Ordovician
- 36 Lower Ordovician
- 37 Cambrian
- 38 Guzhangian
- 39 Paleozoic
- 40 Proterozoic
- 41 Research
- 42 See also
- 43 References
- 44 External links
Def. the "[s]tudy of the forms of life existing in prehistoric or geologic times" is called paleontology.
Clades from the paleontological rock record sometimes display a clade asymmetry. "(Our two cases of Metazoa and mammals represent the first filling of life's ecological "barrel" for multicellular animals, and the radiation of mammals into roles formerly occupied by dinosaurs.)"
Def. "[t]he mineralized remains of an animal or plant" or "[a]ny preserved evidence of ancient life, including shells, imprints, burrows, coprolites, and organically-produced chemicals" is called a fossil.
Derived terms include ichnofossil, index fossil, living fossil, mesofossil, microfossil, and trace fossil.
Micropaleontology is a study of fossil micro-organisms, including foraminifera, which have applications in stratigraphic correlation and age dating along with paleoecology and paleoclimatology.
The image at the right shows microspheric and megalospheric Nummulitid specimens.
Paleobotany is the study of plant or plant-like fossils.
The image at the right shows fronds impressed onto shale in a specimen on display at the Paläontologische Museum München. The fossil is from Scalby Ness, Scarborough, England.
Although regarded as a separate field of its own, in a real sense palynology is the micropaleontological equivalent of paleobotany that involves the study of fossil pollen and spores.
The image at right contains a spore tetrad (in green) of genus Scylaspora and trilete spores (blue, ~30-35μm diameter) from a late Silurian sporangium (Burgsvik beds, Sweden).
Invertebrate paleontology is a study of fossil invertebrate animals, those which lack a backbone. Included are magafaunas whose study doesn't require a microscope, found in various phyla. Applications include stratigraphic dating and correlation, and paleo-ecology.
At the right is an example of invertebrate paleontology, specifically bryozoan fossils in an Ordovician oil shale from Estonia.
Vertebrate paleontology is any study of prehistoric animals with backbones, e.g. fish of various kinds, marine and terrestrial reptiles, dinosaurs, birds, and mammals.
As a representative of vertebrate paleontology, the image at the right shows a skeleton of Mosasaurus hoffmannii on display at the Natural History Museum of Masstricht.
At right is a geologic clock representation. It shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago). Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon. The two million year Quaternary period, the time of recognizable humans, is too small to be visible at this scale.
The following four timelines show the geologic time scale. The first shows the entire time from the formation of the Earth to the present, but this compresses the most recent eon. Therefore the second scale shows the most recent eon with an expanded scale. The second scale compresses the most recent era, so the most recent era is expanded in the third scale. Since the Quaternary is a very short period with short epochs, it is further expanded in the fourth scale. The second, third, and fourth timelines are therefore each subsections of their preceding timeline as indicated by asterisks. The Holocene (the latest epoch) is too small to be shown clearly on the third timeline on the right, another reason for expanding the fourth scale. The Pleistocene (P) epoch. Q stands for the Quaternary period.
The Oligocene Epoch covers 34 - 23 Mya.
"As the Earth began to cool, the tropical plants that had previously been found relatively widespread began to recede towards the equator where it was still warm. The general tropical plants began a transition to more forest like areas. The first grasses also appeared in the late Oligocene. The appearance of these grasses led to to evolution of various herbivore animals. With bodies low to the ground, animals would take advantage of the new grasses that appeared."
After the dinosaurs became extinct, the Cenozoic began.
"The Cretaceous period is the third and final period in the Mesozoic Era. It began 145.5 million years ago after the Jurassic Period and ended 65.5 million years ago, before the Paleogene Period of the Cenozoic Era."
"The Jurassic Period takes place after the Triassic Period and before the Cretaceous Period. This period is well known for the reign of the dinosaurs of its time and the global tropical landscape."
"The Jurassic is a geologic period and system that extends from about 199.6±0.6 Ma (million years ago) to 145.5±4 Ma; that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The start of the period is marked by the major Triassic–Jurassic extinction event. However, the end of the period did not witness any major extinction event."
Leioceras opalinum is an ammonite from the Aalenian.
Psiloceras psilonotum, Psiloceras spelae tirolicum and Psiloceras planorbis are from the Hettangian.
Although the example of Psiloceras tilmanni is from the Jurassic. Its lowest occurrence is in the New York Canyon section of Nevada USA which may be Triassic.
The Atlasov section of the Ladinian contains the crinoid on the right.
An example of Ussuriphyllites amurensis (Kiparisova) is on the right. It is from the Lower-most Anisian, Atlasov Cape area.
Olenekoceras meridianum is a "typical Late Olenekian [fossil which] differs in its lithology from the same zone of Russian Island, where the Zhitkov Suite has been rec- ognized (Zakharov, 1997; Zakharov et al., 2004)."
Hindeodus parvus, a conodont, on the right, is now recognized as the index fossil for the Triassic Induan.
With another mass extinction Mezozoic era started. Now dinosaurs rule.
"A high diversity of terrestrial vertebrates with dinosaurs as the dominant group is strongly indicated but not much of it is yet recorded."
For much of the dinosaur era, the smallest sauropods are larger than anything else in their habitat, and the largest are an order of magnitude more massive than anything else that has since walked the Earth.
"The Lower Sandbian Nemagraptus gracilis Zone comprises one of the most widespread, and easily recognizable graptolite faunas in the Ordovician System. The base of the N. gracilis Zone also marks the base of the Upper Ordovician Series".
On the right is an image of Amplexograptus sp., probably A. perexcavatus (Lapworth, 1876), from the Middle Ordovician near Caney Springs, Tennessee USA.
Although present in the Ordovician around 460 million years ago, about 410 million years ago, the first large marine predators (eurypterids), an order of arthropods, experienced a dramatic decline and are extinct.
"The GSSP level [for the Guzhangian] contains the lowest occurrence of the cosmopolitan agnostoid trilobite Lejopyge laevigata [in the image on the left] (base of the L. laevigata Zone)."
Next 550 mya, after the death of vendobionts, a new era began-the Paleozoic.
After extinction, new spieces named vendobionts appeared.
First era of prehistoric multicellular life.
To conduct original research in paleontology requires statements of generalization usually using universals. Establishing that a phenomenon has occurred may require a proof of concept. Demonstrating a change from contemporary knowledge needs a control group for comparison.
- Ammonites are alive today.
The findings demonstrate a statistically systematic change from the status quo or the control group.
“In the design of experiments, treatments [or special properties or characteristics] are applied to [or observed in] experimental units in the treatment group(s). In comparative experiments, members of the complementary group, the control group, receive either no treatment or a standard treatment."
Def. a “short and/or incomplete realization of a certain method or idea to demonstrate its feasibility" is called a proof of concept.
Def. evidence that demonstrates that a concept is possible is called proof of concept.
The proof-of-concept structure consists of
- findings, and
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- Alexander Mudroch, Ute Richter, Ulrich Joger, Ralf Kosma, Oumarou Idé, Abdoulaye Maga (February 2011). "Didactyl Tracks of Paravian Theropods (Maniraptora) from the ?Middle Jurassic of Africa". PLoS ONE 6 (2): e14642. doi:10.1371/journal.pone.0014642. PMID 21339816. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0014642. Retrieved 2011-09-14.
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