Silurian
adjective
geologyspecializeduk/saɪˈlʊə.ri.ən/us/sɪˈlʊr.i.ən/from or referring to theperiodoftimebetween about 445 and 420 millionyearsago, in whichfishwithjaws(=mouthbones)and someplantsandsmallanimalsonlandfirstappeared:
志留纪的（迄今约4亿4500万至4亿2000万年前的地质时间段，此时期有颌骨的鱼类以及陆地上的植物和小型动物第一次出现）Thegreyslatesand shales of the Silurianrockareobviousas youwalk.
the Silurianperiod志留纪
- TheunderlyingSiktefjellet Group islikelyto be Late Silurian inage,althoughthere is nodirectfossilevidenceof this.
- It has a verylocalfeelwithitssandstonedressings, and isrenderedinroughcast, acommonpracticeinareaslike this where the Silurianstonewasweak.
- Many of these had at onetimebeenvolcanoes, thelavafrom which hadflowedover andcoveredthe Silurianformationin which thegoldbearingquartzwasfound.
Geology - general words
- Anthropocene
- aquifer
- auriferous
- biozone
- Cambrian
- carboniferous
- cementation
- Cretaceous
- Holocene
- hoodoo
- interbed
- Jurassic
- karst
- plate tectonics
- post-depositional
- pyroclastic
- Quaternary
- sedimentation
- tectonic
- the rock cycle
You can also find related words, phrases, and synonyms in the topics:
Prehistory
Specific periods of time
Silurian
noun[S]
uk/saɪˈlʊə.ri.ən/us/sɪˈlʊr.i.ən/the Silurian
theperiodoftimebetween about 445 and 420 millionyearsago, in whichfishwithjaws(=mouthbones)and someplantsandsmallanimalsonlandfirstappeared:
marble-likefossilcorals,datingfrom the Silurian
Veryrecently,discoveriesof some new and verywell-preservedthelodonts from the Silurian of British Columbia wereannounced.
- Currently, biostratigraphicintervalsaveraging500 000 millionyearsareroutinelyrecognizedin the Silurian.
- Within a fewyearshe haddefinedandclassifiedthreeimportantperiodsofgeologicaldevelopment, the Silurian, Devonian and Permian.
- By the late Silurian,colonizationof thechanginglandwithitsnewlyemergingcontinentswas well under way.
Geology - general words
- Anthropocene
- aquifer
- auriferous
- biozone
- Cambrian
- carboniferous
- cementation
- Cretaceous
- Holocene
- hoodoo
- interbed
- Jurassic
- karst
- plate tectonics
- post-depositional
- pyroclastic
- Quaternary
- sedimentation
- tectonic
- the rock cycle
You can also find related words, phrases, and synonyms in the topics:
Prehistory
Specific periods of time