Geologic time is a concept that is not well understood to the general public. Ask a random person to tell you how old, geologically speaking, the earth is, and the answer ranges from a few thousand to a few million, sometimes some people guess a few billion. According to zircons, a small mineral crystal, the earth is around 4.5 Ga old. Ga stands for giga annum, or a thousand thousand, or billion. These small minerals are very resistant to weathering and the oldest of these found on earth date to about the above mentioned time. The geological time scale is basically a time scale that breaks up the earth's history, as found in rock records.
The time scale is broken up into the following: Eons, eras, periods, epochs and ages. Eons. The Eons are from oldest to youngest; Hadean, Archean, Proterozoic and the Phanerozoic. The first three of these can be referred to collectively as the Precambrian supereon.
Where does the Jurassic time period fit in?
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The Phanerozoic eon is divided into the Paleozoic, Mesozoic and Cenozoic Eras. The Mesozoic era is divided into the Triassic, Jurassic and Cretaceous periods. From about 201,3 (+/- 0,2) million years ago - 145 million years ago (according to the geological time scale).
During the Jurassic period, as the movie " Jurassic Park" implies, the Brachiosaurus and Dilophosaurus both featured, but at different times. However, the big, scary mothers, for lack of a better word, the T-Rex, Triceratops, and the Velociraptor were not infact dinosaurs of the Jurassic time period, but rather of the late Cretaceous, so the Park might be better named after that period.
References
https://www.newdinosaurs.com/geologic-time-scale/
http://www.sparknotes.com/mindhut/2013/04/11/top-10-biggest-scientific-errors-in-jurassic-park
Image
https://commons.m.wikimedia.org/wiki/User:Woudloper
https://www.google.co.za/search?q=dinosaur&safe=active&client=ms-android-hms-vf-za&prmd=ivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwip5sLmp8nZAhVCPsAKHQgXAJgQ_AUIESgB&biw=360&bih=560#imgrc=QDFbPF9PTJgJ2M:
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