The holy books say "in the beginning the world was without form and void".

No one knows how old the earth is, or where it  came from. The best method to estimate age is by isochron age dating, used since 1979.

By combining several test methods, scientists set earth age 4.54 billion years +/- 1%.

The most significant event of 251 mya was the great extinction in which over 70% of all life on earth disappeared. Theories about how and why they died is still heavily debated.

 

25 million years later, accept Africa as point of origin, techtonic plate movements are splitting one land mass into seven future continents.

At that broad point in time, land animals could roam wherever they wanted to go. 

The Triassic was a time of transition, as global climate and ocean circulation changed. It was a time for the survivors of the extinction to move  and recolonized the earth.

  

During the Jurassic Period was when dinosaurs and other animals of their period rode on the continents toward their final location, evolving and growing and developing new speacies as they came.

It was also a period when techtonics moved the continents apart, changing landscapes and climate as they moved at a rate of 5 inches per year.

Dynosaur remains have been found on every continent, including Antartica. But over half of dynosaurs found in the world were found here in North and South America.

The Cretaceous period saw the end of the "Age of Dinosaurs", remains of which are found today in the "K" layer of earth.

The Cretaceous also ushered in new dinosaurs like ceratopsian and pachycepalosaurid lines.

Also during this layer of earth we find the first fossils of many insect groups, modern mammal and bird groups, and the first flowering plants.

Pangea during the Jurassic continued to break up, and as time passed, and the continents moved, increased regional differences in floras and faunas between the northern and southern continents had affect.

The end of the Cretaceous brought the end of many previously successful and diverse groups of like non-avian dinosaurs and ammonites.

This set the for groups formerly in secondary roles began to devolop. The Cretaceous was an when life, as we know it, started to evolve. 

94 million years ago plate techtonics were at work moving continents, but still had a long way to go, and today they are still moving.

From Africa the central point, South and North America inched to the west.

India took a jog north-east then straight north to the Asian Continent;

Australia split from Antartica and moved a long distance north-east where  it ran into  the Asian plate.

Such techtonic movements spawned many volcanos ahead of them.   

65 million years ago continents moving about 5 inches per year were joining together into a form similar to what we have today.

Land between North and South America raised of join the continents and form Central America.

Texas, New Mexico, Arizona, Utah, Colorado, Kansas, and other states north to Canada, were under a shallow sea. 

The "ring of fire" volcanos were spawned by the overlapping edges of techtonic plates.

As techtonic movement spawned volcanos, it also thrust the land up a mile and drained the shallow sea into the Gulf of Mexico, and the dry land became heavily forested.    

 
Dinosaurs between 130 and 65 million years ago, ruled the earth. All of the dinosaurs in the table above lived in north and south America. They lived on every continent including Antartica, but more than 50% of the dinosaur fossels are found here in north and south America. They all died around 65 million years ago leaving birds, small mammels and fish as survivers of whatever great catastrophy killed them.
 
The most famous of them all was Tyrannasaurus Rex, the great killing machene. Yet his nine cousins were almost as bad as he, just not as famous. Any of them could ruin your day.
 
The guy himself......or perhaps her herself. Makes little difference. More here and below
 
 
 
 
 
Some friendlier dinos
 
Bad to the bone.
 
 
Canned Histories TM by donkelly
All rights reserved.