English-Thai Dictionary

cretaceous

A เกี่ยวกับ ยุค  Mesozoic era ที่ ไดโนเสาร์ สูญพันธุ์ จาก โลก 

 

Webster's 1828 Dictionary

CRETACEOUS

a.[L., chalk. ] Chalky; having the qualities of chalk; like chalk; abounding with chalk.

 

Webster's 1913 Dictionary

CRETACEOUS

Cre *ta "ceous (kr-t "shs ), a. Etym: [L. cretaceus, fr. creta chalk. See Crayon. ]

 

Defn: Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk. Cretaceous acid, an old name for carbonic acid. -- Cretaceous formation (Geol.), the series of strata of various kinds, including beds of chalk, green sand, etc. , formed in the Cretaceous period; -- called also the chalk formation. See the Diagram under Geology. -- Cretaceous period (Geol.), the time in the latter part of the Mesozoic age during which the Cretaceous formation was deposited.

 

CRETACEOUS; CRETACIC

Cre *ta "ceous, a. Also Cre *tac "ic. (Geol.)

 

Defn: Of, pertaining to, or designating, the period of time following the Jurassic and preceding the Eocene.

 

CRETACEOUSLY

CRETACEOUSLY Cre *ta "ceous *ly, adv.

 

Defn: In a chalky manner; as chalk.

 

New American Oxford Dictionary

Cretaceous

Cre ta ceous |krəˈtāSHəs krəˈteɪʃəs | ▶adjective Geology of, relating to, or denoting the last period of the Mesozoic era, between the Jurassic and Tertiary periods. • (as noun the Cretaceous ) the Cretaceous period or the system of rocks deposited during it. The Cretaceous lasted from about 146 million to 65 million years ago. The climate was warm, and the sea level rose; the period is characterized esp. in northwestern Europe and parts of North America by the deposition of chalk. The first flowering plants emerged, and the domination of the dinosaurs continued although they died out quite abruptly toward the end of it. ORIGIN late 17th cent.: from Latin cretaceus (from creta ‘chalk ’) + -ous .

 

Cretaceous–Tertiary boundary

Cre ta ceous –Ter ti ar y bound a ry (also K /T boundary ) Geology the division between the Cretaceous and Tertiary periods, about 65 million years ago. A widespread layer of sediment dating from this time has been shown since 1980 to be enriched in iridium and other elements and carbon deposits indicative of extensive fires. This appears to indicate the catastrophic impact of one or more large meteorites, and geologists have identified a formation at Chicxulub in the Yucatán Peninsula, Mexico, as a probable impact site. A resulting drastic climate change has been suggested as the cause of the extinction of dinosaurs and many other organisms at this time, but this remains controversial.

 

Oxford Dictionary

Cretaceous

Cretaceous |krɪˈteɪʃəs | ▶adjective Geology relating to or denoting the last period of the Mesozoic era, between the Jurassic and Tertiary periods. • (as noun the Cretaceous ) the Cretaceous period or the system of rocks deposited during it. The Cretaceous lasted from about 146 to 65 million years ago. The climate was warm and the sea level rose; the period is characterized especially in NW Europe by the deposition of chalk. The first flowering plants emerged and the domination of the dinosaurs continued, although they died out quite abruptly towards the end of it. ORIGIN late 17th cent.: from Latin cretaceus (from creta ‘chalk ’) + -ous .

 

Cretaceous–Tertiary boundary

Cretaceous –Tertiary boundary (also K /T boundary ) Geology the division between the Cretaceous and Tertiary periods, about 65 million years ago. A widespread layer of sediment dating from this time has been shown since 1980 to be enriched in iridium and other elements and to contain minerals showing evidence of thermal shock and carbon deposits indicative of extensive fires. This appears to indicate the catastrophic impact of one or more large meteorites, and geologists have identified a formation at Chicxulub in the Yucatán Peninsula, Mexico, as a probable impact site. A resulting drastic climate change has been suggested as the cause of the extinction of dinosaurs and many other organisms at this time, but this remains controversial.

 

Sanseido Wisdom Dictionary

cretaceous

cre ta ceous /krɪtéɪʃəs /形容詞 1 白亜 (質 )の .2 〖通例the C- 〗〘地 〙白亜紀 [系 ]の .名詞 〖通例the C- 〗〘地 〙白亜紀 [系 ].