侏羅紀(符:J),地質年代也。在三疊、白堊之間,去今約億九千九百六十萬年,至億四千五百五十萬年。
侏羅紀者,中生代之第二紀也,肇於三疊紀末滅絕之事。此代岩石雖易辨,惟其始末之時難定,測之有誤矣。
紀先,曾歷滅絕,百昌稀少,獨恐龍崛起,稱霸坤輿。後,治世億五千萬年,至白堊紀末滅絕。
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