220,000,000 BP to 200,000,000 BP

220,ooo,ooo BP t0 200,000,000 BP 

 200,000,000 BP to 145,000,000 BP: This is the time of the Jurassic Period. This Geological Period fell between the Triassic and Cretaceous Periods. It was during this time that the super contnent Pangaea began to drift apart and to begin much of our present continental geography. During this period there was lots of life, a wet climate, and lush vegetation. Many new dinosaurs appeared. Conifers appeared. Mammals were common, but small. There is evidence of early birds and lizards. Were there worms then or not? There was a lessor extinction toward the end of this Period.

200,000,000 BP: Pangea still exists united, but faults begin to define the continents of today.

300,000,000 BP to 280,000,000 BP

 300,000,000 to 280,000,000 BP

298.9 Mya, Cisuralian, Asselian: The firs true mosses, beetles and flies evolve.

Marine flourish in warm shallow seas.

295 Mya, Cisuralian, Sakmarian: Coal age flora are being replaced by cone-bearing gymnosperms, the first true seed plants

290.1 Mya, Cisuralian, Artinskian: Amphibians are common. Cone bearing flora appearing.

283.5 Mya, Paleozoic, Permian, Cisuralian, Kungurian: Parareptiles and temnospondyl amphibians are common. 

 

 

 

        

251,900,000 BP to 201,300,000 BP: Triassic Period: This time has been called the Triassic Period. The Triassic Period falls after the Permian Period and before the Jurassic Period. First evidence of mammals appear, a mouse like critter is found to lie within the Period. This geologic period ended with a mass extinction of species.

200 Mya to 180 Mya

 200 Mya to 180 Mya

usage notes: Mya points to "millions of years ago I referens to "before the present;"

 

 

 

 200 Mya: Pangea existed as present continents united.

200 Mya to 145 Mya: This is the duration of the Jurassic geological Period. The Jurassic Period fell between the Triassic and Cretaceous Periods,

~ The super continent Pangaea began to drift apart during this Period.

~ There was lots of life, wet climate, and lush vegetation. Many new dinosaurs appeared. Conifers appeared. Mammals were common, but small. There is evidence of early birds and lizards, our first evidence of them.

~ There was a "minor"extinction toward the end of this period.

200,000,000 BP: At this very beginning of the Jurassic Period

Pangea exists. Present continents become defined but are still united. 

 

201,000,000 BP to 152,000,000 BP: Jurassic Period: This period was been divided into the Early, Middle, and Late Jurassic. The Early Jurassic is made up of four ages: the Hettangia, the Sineemurian,, the Pliensbachisan, and the Toarcian. We have begun a geological timeline. I'll add that there were already some small mammals around at this early age,