Ordovician
adjective
geologyspecializeduk/ˌɔː.dəˈvɪʃ.ən/us/ˌɔːr.dəˈvɪʃ.ən/from or referring to theperiodoftimebetween about 485 and 445 millionyearsago, in which there were many differenttypesofanimalsin thesea,includingvertebrates(=animalswithbackbones), but nolifeonland:
奥陶纪的（距今约4亿8千5百万年至4亿4千5百万年前间，此时水中已有许多动物包括脊椎动物，但是陆地上还没有动物）For hisPhDhemappedWelshOrdovicianrocksanddescribednewspeciesoffossils.
In mid Ordoviciantimesavolcanicislandarcisthoughtto haveextendedthrough theEnglishLake District,Walesand Newfoundland.
- Astimepassedthere was apossibleloweringoflocaltemperaturesin thesucceedingOrdovicianperiod.
- The sameunfortunatelyisn't thecasefor the verybrieflate Ordoviciancoldspell.
- An early Ordoviciantrenchisthoughtto haveextendedfrom justnorthof theSouthernUplands ofScotlanddownacrossnorthernIreland.
Geology - general words
- Anthropocene
- aquifer
- auriferous
- biozone
- Cambrian
- carboniferous
- cementation
- Cretaceous
- Holocene
- hoodoo
- interbed
- Jurassic
- karst
- plate tectonics
- pyroclastic
- Quaternary
- sedimentation
- selenologist
- tectonic
- the rock cycle
You can also find related words, phrases, and synonyms in the topics:
Prehistory
Specific periods of time
Ordovician
noun[S]
geologyspecializeduk/ˌɔː.dəˈvɪʃ.ən/us/ˌɔːr.dəˈvɪʃ.ən/the Ordovician
theperiodoftimebetween about 485 and 445 millionyearsago, in which there were many differenttypesofanimalsin thesea,includingvertebrates(=animalswithbackbones), but nolifeonland:
This firsthappenedearly in the Ordovician.
As the Ordovicianprogressed, theseparationbetween the twocontinentsdecreasedand they bothacquiredwarmenvironments.
- At Builth inCentralWales, acomplicatedhistoryhas beenworkedout for onepartof the Ordovician.
- Extensive volcanismoccurredduring the Ordovician in the Lake District andWales.
- In the late Ordovician , thesestratawereintrudedby doleritesillsandstocks.
Geology - general words
- Anthropocene
- aquifer
- auriferous
- biozone
- Cambrian
- carboniferous
- cementation
- Cretaceous
- Holocene
- hoodoo
- interbed
- Jurassic
- karst
- plate tectonics
- pyroclastic
- Quaternary
- sedimentation
- selenologist
- tectonic
- the rock cycle
You can also find related words, phrases, and synonyms in the topics:
Prehistory
Specific periods of time