左手臂发麻是什么原因

??????????? ????? ????? 541–485.4?????????? ???????????? ???? Pre? ? O S D C P T J K Pg N
Mean atmospheric O ₂ content over period duration	c. 12.5 vol?%^[1]^[2] (63?% of modern level)
Mean atmospheric CO ₂ content over period duration	c. 4500 ppm^[3]^[4] (16 times pre-industrial level)
Mean surface temperature over period duration	c. 21?°C^[5]^[6] (7?°C above modern level)
Sea level (above present day)	Rising steadily from 30?m to 90?m^[7]

百度要坚持顺应民心办实事。

??????????? ?????? ??????????? ????? (Cambrian) ?????? 541±?1.0 ????????? ???????????? ??????????? 485.4±?1.7 ????????? ???????????? ???? ?????? ???????? ??????????? ???? ???????????? ??????????. ?????????????? ??????? 6 ?????????? ???????? ?????? ??????????? ????? ????????????? ??????? ?????????????? ???????????? ????????? ???????? ?????? ????????? ???????????. ??????????? ????? ?????????? ????????????? ????????????. ???????????? ?????, ???????????? ??????? ????? ???????? ??????? ??????????????????????? ????? ???????? ???????? ?????? ???????????????????? ???????????????.

??????????? ????????????? ?????????? ????????? ????????? ??????????????? ?????????????? ?????????????????? ????? ?????? ????? ??????????? ?????????. ??????? ????????? ????????????? ?????????? ????????? ????????? ????????? ??????? ????????? ”????????? ????????” ????????????. ????????????????? ??????? ?????? ?????????????????, ???????????? ???????? ???? ????????????????? ???????? ?????? ???????? ???????????????????? 1994 ??? ????? ??????????? ?????? ??? ?????? ???????? ?????? ??????? ?????????????. ??????????? ????????? ???????? '('Trichophycus pedum ?????????) ??????? ?????????? ?????????? ?????? ????????????????????????.

???????????

↑ Image:Sauerstoffgehalt-1000mj.svg
↑ Image:OxygenLevelsThroughEarthHistory.png
↑ Image:Phanerozoic Carbon Dioxide.png
↑ Image:CO2LevelsThroughEarthHistory.png
↑ Image:All palaeotemps.png
↑ Image:TemperatureLevelsOverEarthHistory.png
↑ Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science 322 (5898): 64–8. doi:10.1126/science.1161648. ???????:18832639. Bibcode:?2008Sci...322...64H.?

???????????????

Biostratigraphy – includes information on Cambrian trilobite biostratigraphy
Dr. Sam Gon's trilobite pages (contains numerous Cambrian trilobites)
Examples of Cambrian Fossils
Paleomap Project
Report on the web on Amthor and others from Geology vol. 31
Weird Life on the Mats

Paleozoic Era
??????????? ?????	???????????? ?????	????????? ?????	????????? ?????	?????????????? ?????	????????? ?????

[1] Image:Sauerstoffgehalt-1000mj.svg

[2] Image:OxygenLevelsThroughEarthHistory.png

[3] Image:Phanerozoic Carbon Dioxide.png

[4] Image:CO2LevelsThroughEarthHistory.png

[5] Image:All palaeotemps.png

[6] Image:TemperatureLevelsOverEarthHistory.png

[7] Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science 322 (5898): 64–8. doi:10.1126/science.1161648. ???????:18832639. Bibcode:?2008Sci...322...64H.?

[1]

[2]

[3]

[4]

[5]

[6]

[7]

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