Acer beckianum: Difference between revisions
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==History and classification== |
==History and classification== |
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The type specimen was part of a collection compiled by Jay O'Leary, who was then a student of [[Harvard College]], in 1954 from the west bank of the Columbia river in the area of [[Vantage, Washington]].<ref name="Vantagewoods1961">{{cite journal |last1=Prakash |first1=U. |last2=Barghoorn |first2=E. S. |year=1961 |title=Miocene fossil woods from the Columbia Basalts of central Washington |journal=Journal of the Arnold Arboretum |volume=42 |issue=2 |pages=165–203 |url=https://www.biodiversitylibrary.org/page/8441933#page/172/mode/1up}}</ref> The petrified wood is preserved in an interbed area between the older [[Columbia River Basalt Group|Grande Ronde Basalt]] and the younger [[Columbia River Basalt Group|Wanapum basalts]], with the interbed overlain by the Ginkgo Flow,<ref name="Dillhoff">[http://www.evolvingearth.org/mcabee/fossilwoods/part1introduction.pdf Miocene Woods Of Eastern Washington] Accessed 23 May 2011</ref> the oldest segment of the Frenchman Springs Member of the Wanapum basalts. [[K–Ar dating]] performed on the Grande Ronde Basalts gives an age of 15.6 million years old, and dating of the Frenchman Springs Member gives a date of 15.3 million years old.<ref name="Wiemann1999">{{cite journal |last1=Wiemann |first1=M. C. |last2=Manchester |first2=S. R. |last3=Wheeler |first3=E. A. |year=1999 |title=Paleotemperature estimation from dicotyledonous wood anatomical characters |journal=Palaios |volume=14 |issue=5 |pages=459-474}}</ref> This places the vantage woods as from the [[Langhian|Langhian stage]] of the [[Miocene]].<ref name="Dillhoff"/> |
The type specimen was part of a collection compiled by Jay O'Leary, who was then a student of [[Harvard College]], in 1954 from the west bank of the Columbia river in the area of [[Vantage, Washington]].<ref name="Vantagewoods1961">{{cite journal |last1=Prakash |first1=U. |last2=Barghoorn |first2=E. S. |year=1961 |title=Miocene fossil woods from the Columbia Basalts of central Washington |journal=Journal of the Arnold Arboretum |volume=42 |issue=2 |pages=165–203 |url=https://www.biodiversitylibrary.org/page/8441933#page/172/mode/1up}}</ref> The petrified wood is preserved in an interbed area between the older [[Columbia River Basalt Group|Grande Ronde Basalt]] and the younger [[Columbia River Basalt Group|Wanapum basalts]], with the interbed overlain by the Ginkgo Flow,<ref name="Dillhoff">[http://www.evolvingearth.org/mcabee/fossilwoods/part1introduction.pdf Miocene Woods Of Eastern Washington] Accessed 23 May 2011</ref> the oldest segment of the Frenchman Springs Member of the Wanapum basalts. [[K–Ar dating]] performed on the Grande Ronde Basalts gives an age of 15.6 million years old, and dating of the Frenchman Springs Member gives a date of 15.3 million years old.<ref name="Wiemann1999">{{cite journal |last1=Wiemann |first1=M. C. |last2=Manchester |first2=S. R. |last3=Wheeler |first3=E. A. |year=1999 |title=Paleotemperature estimation from dicotyledonous wood anatomical characters |journal=Palaios |volume=14 |issue=5 |pages=459-474}}</ref> This places the vantage woods as from the [[Langhian|Langhian stage]] of the [[Miocene]].<ref name="Dillhoff"/> Mean annual temperature estimates for the vantage paleoclimate were made based on analysis of the fossil wood. Based on a series of wood anatomy characters, a temperature range between {{convert|15.8|-|16.2|°C|°F|abbr=on}}. This is distinctly warmer then the modern mean annual temperature of {{convert|8.4|°C|°F|abbr=on}}. |
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==References== |
==References== |
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Revision as of 23:39, 25 June 2018
| Acer beckianum Temporal range:
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Sapindales |
| Family: | Sapindaceae |
| Genus: | Acer |
| Species: | A. beckianum
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| Binomial name | |
| Acer beckianum Prakash & Barghoorn, 1961
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Acer beckianum is an extinct maple species in the family Sapindaceae described from a single fossil wood section. The species is solely known from the Middle Miocene sediments exposed in central Washington State, USA. It is one of three Washington state Acer species described in 1961 from petrified wood.
History and classification
The type specimen was part of a collection compiled by Jay O'Leary, who was then a student of Harvard College, in 1954 from the west bank of the Columbia river in the area of Vantage, Washington.[1] The petrified wood is preserved in an interbed area between the older Grande Ronde Basalt and the younger Wanapum basalts, with the interbed overlain by the Ginkgo Flow,[2] the oldest segment of the Frenchman Springs Member of the Wanapum basalts. K–Ar dating performed on the Grande Ronde Basalts gives an age of 15.6 million years old, and dating of the Frenchman Springs Member gives a date of 15.3 million years old.[3] This places the vantage woods as from the Langhian stage of the Miocene.[2] Mean annual temperature estimates for the vantage paleoclimate were made based on analysis of the fossil wood. Based on a series of wood anatomy characters, a temperature range between 15.8–16.2 °C (60.4–61.2 °F). This is distinctly warmer then the modern mean annual temperature of 8.4 °C (47.1 °F).
References
- ^ Prakash, U.; Barghoorn, E. S. (1961). "Miocene fossil woods from the Columbia Basalts of central Washington". Journal of the Arnold Arboretum. 42 (2): 165–203.
- ^ a b Miocene Woods Of Eastern Washington Accessed 23 May 2011
- ^ Wiemann, M. C.; Manchester, S. R.; Wheeler, E. A. (1999). "Paleotemperature estimation from dicotyledonous wood anatomical characters". Palaios. 14 (5): 459–474.