Everett Claire Olson (November 6, 1910 – November 27, 1993) was an American

zoologist Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and ...

paleontologist Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of foss ...

, and

geologist A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, earth science, or geophysics, alt ...

noted for his seminal research of origin and evolution of vertebrate animals.National Academy Press:Biographical Memoirs:Everett C. Olson;By Michael A. Bell
/ref>University of California; In Memoriam;Everett Claire Olson, Biology: Los Angeles; Professor Emeritus
/ref>University of Chicago:Department of the Geophysical Sciences:About Us:Everett C. Olson was trained as a vertebrate paleontologist and carried out pioneering research on the evolution of terrestrial ecosystems
/ref> Through his research studying terrestrial vertebrate fossils he identified intervals of extinction in the

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Pale ...

and

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

. He also proposed stratigraphic correlations between North American (especially the

Chickasha Chickasha is a city in and the county seat of Grady County, Oklahoma, United States. The population was 16,036 at the 2010 census. Chickasha is home to the University of Science and Arts of Oklahoma. The city is named for and strongly connecte ...

and San Angelo Formations) and Russian vertebrate-bearing strata for which additional support was found much later. The drop in terrestrial vertebrate diversity he proposed in at the end of the

Kungurian In the geologic timescale, the Kungurian is an age or stage of the Permian. It is the latest or upper of four subdivisions of the Cisuralian Epoch or Series. The Kungurian lasted between and million years ago (Ma). It was preceded by the Art ...

stage of the

Permian period The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

that occurred 270 million years ago now carries his name -

Olson's Extinction Olson's Extinction was a mass extinction that occurred in the late Cisuralian or early Guadalupian of the Permian period and which predated the Permian–Triassic extinction event. It is named after Everett C. Olson. There was a sudden change be ...

. Alternatively, some scientists think that the change was gradual but that it looks abrupt because of a gap in the fossil record, called "Olson's Gap". Some of his other notable research also included the

taxa In biology, a taxon ( back-formation from '' taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular n ...

'' Slaugenhopia'', ''

Trimerorhachis ''Trimerorhachis'' is an extinct genus of dvinosaurian temnospondyl within the family Trimerorhachidae. It is known from the Early Permian of the southwestern United States, with most fossil specimens having been found in the Texas Red Beds. T ...

'', and ''

Waggoneria ''Waggoneria'' is a genus of seymouriamorph from the Early Permian of Texas. It was named by American paleontologist Everett C. Olson in 1951 on the basis of a holotype fossil that included a weathered skull, lower jaws, vertebrae, and part of ...

''.The evolution of a Permian vertebrate;Everett C Olson
/ref> Olson was a former chair of the department of Biology at the

UCLA The University of California, Los Angeles (UCLA) is a public university, public Land-grant university, land-grant research university in Los Angeles, California. UCLA's academic roots were established in 1881 as a Normal school, teachers colle ...

, a member of the

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nat ...

, a recipient of Paleontological Medal of the

Paleontological Society The Paleontological Society, formerly the Paleontological Society of America, is an international organisation devoted to the promotion of paleontology. The Society was founded in 1908 in Baltimore, Maryland, and was incorporated in April 1968 in ...

(1987), the first recipient of the

Romer-Simpson Medal The Romer-Simpson Medal is the highest award issued by the Society of Vertebrate Paleontology for "sustained and outstanding scholarly excellence and service to the discipline of vertebrate paleontology". The award is named in honor of Alfred S. ...

of the Society of Vertebrate Paleontology, a CSEOL Distinguished Scientist (1991).

University of California The University of California (UC) is a public land-grant research university system in the U.S. state of California. The system is composed of the campuses at Berkeley, Davis, Irvine, Los Angeles, Merced, Riverside, San Diego, San Fran ...

said that Olson "was an internationally recognized pioneer in studies of the origin and evolution of vertebrate animals". The

University of Chicago The University of Chicago (UChicago, Chicago, U of C, or UChi) is a private university, private research university in Chicago, Illinois. Its main campus is located in Chicago's Hyde Park, Chicago, Hyde Park neighborhood. The University of Chic ...

said that he "carried out pioneering research on the evolution of terrestrial ecosystems". The

said that he ranked "among the great vertebrate paleontologists of the twentieth century".

Life and career

Olson was born in

Waupaca, Wisconsin Waupaca is a city in and the county seat of Waupaca County in the U.S. state of Wisconsin. The population was 6,282 at the 2020 census. The city is located mostly within the Town of Waupaca, and it is politically independent of the town. A p ...

and grew up in

Hinsdale, Illinois Hinsdale is a village in Cook and DuPage counties in the U.S. state of Illinois. Hinsdale is a western suburb of Chicago. The population was 17,395 at the 2020 census, most of whom lived in DuPage County. The town's ZIP code is 60521. The to ...

. Olson received his undergraduate and graduate degrees, including Ph.D. in

geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ea ...

(1935) from the

References

External links

Worldcat for Everett C. Olson
{{DEFAULTSORT:Olson, Everett C. 1910 births 1993 deaths American paleontologists 20th-century American geologists 20th-century American zoologists University of Chicago faculty University of Chicago alumni University of California, Los Angeles faculty Members of the United States National Academy of Sciences People from Waupaca, Wisconsin People from Hinsdale, Illinois