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One of the more intriguing periods in the history of North America was the Pleistocene Epoch.  It was a time when the earth was locked in the chilling grip of an Ice Age, it was also a time of transition when man and prehistoric beasts shared the continent.

 

The Fossil Layer: Ice Age Mammals

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The
Woolly Mammoth

Woolly Mammoth Tooth (Dr. Von Zuko)
The Woolly Mammoth roamed North America and  the European continent during the Pleistocene Epoch in the Quaternary Period (the time in which we now live).  

Ancient cave paintings found at prehistoric archeological sites provide solid evidence that the (now extinct) Wooly Mammoth shared the planet at the same time as Paleolithic man. 

The Pleistocene began about one million years ago and was a time that saw massive ice sheets, some as thick as 10,000 feet, (that's nearly 2 miles thick)  covering much of the Northern Hemisphere along with several mountain ranges in the Southern Hemisphere.   The earth was a cold and hostile place in this time period and this particular "ice age" produced at least four very significant glacial advances that didn't retreat until approximately 10,000 years ago.  

The Woolly Mammoth was an imposing creature standing up to 14 feet tall at the shoulder, and brandishing massive curved tusks that were as much as 13 feet in length.  The Woolly Mammoth was well equipped for life in the ice age with a thick hide and a massive fur coat.  These large animals all became extinct sometime near the end of the Pleistocene.  (Likely hunted to extinction by Paleolithic man.)
 Woolly Mammoth Tooth

The Mammoth Tooth Fossil Specimen.

This rare, and gigantic 7 inch (179 mm) "Collector-Grade"  late Pleistocene Woolly Mammoth tooth is approximately 25,000 years old.   

The tooth was found in the Netherlands in Pleistocene deposits  in the Rhine River.  This well preserved tooth is in remarkable condition with great chewing surfaces and superb roots. (few mammoth teeth are ever found with complete roots.)


Smilodon fatalis "The Saber Tooth"
 
Saber Tooth - zuko.com
Smilodon fatalis appeared on the North American continent roughly 1.6 million years ago and passed into extinction a mere 10,000 years ago.

By any measure, this saber-toothed cat was one of the most ferocious predators of it’s time. In the last 15,000 years of its existence it shared the continent with Paleolithic man, which I’m sure resulted in extreme peril for both species.

The Smilodon is believed to have been a somewhat social creature, living and hunting in packs much like modern African lions.  According to paleontologists these packs roamed open grasslands and the pleistocene forests in search of prey. Their heavy skeletal remains suggest that rather than running down prey in the open, they used their very powerful bodies and stealth to ambush the unwary.

The saber tooth also had immensely powerful jaws that could open to a staggering 120 degrees and its long canine sabers were used to slash the throat of its prey.  Much like the modern Tiger, the saber tooth was a large animal between 39 to 47 inches tall (on all fours) 8 to 9 feet long and ranging in weight from about 350 to nearly 500 lbs.


Cave Bear Jaw

Cave Bear Jaw zuko.com
This is the jaw bone of a late Pleistocene period Cave Bear (Ursus Speleaus).  

This imposing omnivore was the last species of an evolutionary line of "cave bears", it stood about 5 feet tall at the shoulder (on all fours) and was approximately 6 and a half feet from the tip of its nose to its tail.  In comparison, it was a bit larger than the  average Alaskan Brown Bear is today.

Ursus spelaeus was fairly common in the late Pleistocene Ice Age, through most of central and southern Europe, including southern England and extending to the Caspian Sea. In one cave in Austria, the remains of more than 30,000 cave bears were found, indicating repeated use of the cave by these large animals.

In Medieval Europe, the discovery of cave bear teeth in the dark recesses of caves, (lacking the science of Paleontology) gave rise to legends of dreaded creatures called dragons.

This jaw was found in a cave in the Rumanian Bihor Mountains.

Large Cave Bear Paw - zuko.comComplete, incredibly well preserved paw of a Cave Bear from the late Pleistocene Ice Age.

This specimen was also found in a cave in Austria.

 


The Pleistocene, The Last Ice Age:

The Pleistocene Epoch was the period of time in which the earth experienced its most recent Ice Age.  During that period of roughly 1.6 million years massive Ice Sheets, sometimes towering up to 10,000 feet thick covered a huge expanse of land across the planet.  There were at least 20 discernable glaciations where the surface area and thickness of the ice cover increased, each followed by periods of interglaciations where the ice cover melted.

The most recent glaciation in North America is referred to as the Wisconsin glaciation and it occurred from about 115,000 years ago, finally ending around 10,000 years ago.  Since the end of the Wisconsin glaciation the earth has enjoyed a relatively warm 10,000 year period (an interglaciation). 

The climate during the Pleistocene Epoch was considerably colder then it is today, on average as much as 27° F colder.  In that period significant geological changes were also brought about by the massive ice sheets.  Vast areas of land were compressed under millions of tons of slowly moving ice, entire mountains and even volcanoes, were plowed under and new land masses formed.  New rivers, lakes and vast inland seas were created, and existing ones altered or obliterated completely.  During the periods of glaciation, sea levels dropped by as much as 500 feet (in contrast to today’s sea levels) exposing new land for thousands of years, and then returning them into the seas as the ice melted.  

It is highly likely that early human inhabitants occupied these (now submerged) coastal areas to benefit from the warmer ocean currents and a more sustainable food source.  As the science and tools of underwater archaeology advances new discoveries regarding our ancient coastlines and Paleolithic peoples will emerge.     

The Ice Age Mammals Collection:

Dr. Von Zuko's Recommended Books on Prehistoric Fossils:

  

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Ancient Horse - Ohio

 Pleistocene Horse Ankle Bone  Zuko.com    Pleistocene Horse - zuko.com

This ankle bone from a Pleistocene horse (similar to the present day horse) was found by Dr. Von Zuko in an excavation in Central Ohio. 

This horse was approximately 60" tall, with one toe, or hoof (earlier ancient horses had 3 toes).  It roamed the mid-western plains around 4,000 to 8,000 years ago.  Rather than being domesticated, it was hunted as a  source of food for the Paleolithic and Archaic period hunter.  

Fossilized Pleistocene Horse Tooth

Ancient Horse Tooth - Photo by Dr. Von ZukoThis very well preserved and colorful fossil tooth was retrieved from the bottom of an ancient Florida river in 2004. 

It is a near perfect, fully intact 3 inch specimen.

Despite the fact that this tooth has spent many centuries at the bottom of a slow moving river, it has superb detail and an absolutely awesome multi-color luster.
 

 


 


 Dire Wolf (Canis dirus)

Dire Wolf Skull

The Dire Wolf was a prolific and rather abundant Pleistocene predator that roamed North America until about 10,000 years ago. While related to the modern day Gray Wolf, the Dire Wolf is not the direct ancestor of any known modern species.

The Dire Wolf was quite large weighing in at approximately 200 lbs and measuring about 7 feet from nose to tail. While the first fossil remains of the Dire Wolf were found along the Ohio River in 1854, this wolf roamed the entire continent.

The Dire Wolf hunted in packs in a wide range of habitats. Its heavy skeletal structure however, suggests that it may not have been a particularly fast runner and With massive teeth well suited to crushing bone, the Dire was likely a scavenger as well as a hunter.

A very large number of Dire Wolf skeletons have been recovered from the La Brea Tar pits perhaps entombed while trying to prey on other animals stuck helplessly in the tars.

While it is generally believed that the Dire Wolf went extinct with other megafauna 10,000 years ago, more recent fossil finds suggest that a small population of Dire Wolf lived in the Ozark mountain region until approximately 4,000 years ago.

 

 

 


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