Mesozoic Dinosaurs - Enchanted Learning

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The Mesozoic Era (248 - 65 million years ago) Ages of the Mesozoic Era
Triassic Period 248 - 206 mya First dinosaurs and mammals		Jurassic Period 206-144 mya Many dinosaurs and the first birds			Cretaceous Period 144-65 mya First flowering plants, the height of the dinosaurs. Ends in huge extinction.
Early - Middle 248-227 mya	Late 227-206 mya	Early (Lias) 206-180 mya	Middle (Dogger) 180-154 mya	Late (Malm) 154-144 mya	Early (Neocomian) 144-127 mya	Middle (Gallic) 127-89 mya	Late (Senonian) 89-65 mya

THE AGES OF THE MESOZOIC ERA

The Mesozoic lasted 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous. Mesozoic means "Middle Animal." The world's life forms were very different during the Mesozoic than either before or after. During the Mesozoic, dinosaurs evolved and dominated the Earth, and mammals and birds evolved. After the Mesozoic Era, the Cenozoic Era or the "Age of Mammals" began. 40 percent of the known dinosaurs date from the last 15 million years of the Cretaceous period.

Epochs and Ages of the Mesozoic Era
(Mya means millions of years ago.)

Era	Period	Epoch		Age	Time Span (mya)
Cenozoic					0-65
Mesozoic	Cretaceous	Late	Senonian	Maastrichtian	65-71
				Campanian	71-83
				Santonian	83-86
				Coniacian	86-89
			Gallic	Turonian	89-93
				Cenomanian	93-99
		Early		Albian	99-112
				Aptian	112-121
				Barremian	121-127
			Neocomian	Hauterivian	127-132
				Valanginian	132-137
				Berriasian	137-144
	Jurassic	Late = Malm		Tithonian = Portlandian	144-151
				Kimmeridgian	151-154
				Oxfordian	154-159
		Middle = Dogger		Callovian	159-164
				Bathonian	164-169
				Bajocian	169-177
				Aalenian	177-180
		Early = Lias		Toarcian	180-190
				Pliensbachian	190-195
				Sinemurian	195-202
				Hettangian	202-206
	Triassic	Late = Tr3		Rhaetian	206-210
				Norian	210-221
				Carnian	221-227
		Middle = Tr2		Ladinian	227-234
		Middle = Tr2		Anisian	234-242
		Early = Scythian		Olenekian = Spathian & Nammalian	242-245
		Early = Scythian		Induan = Griesbachian	245-248
Paleozoic					248 - 540

(ref. Gradstein, F. M., F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. van Veen, J. Thierry and Z. Huang. 1995. A Mesozoic Time Scale. Journal of Geophysical Research 99 (B12): 24,051-24.074.)

For a more complete chart of geologic time, click here.

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