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AMONG MY TRILOBITES

THE CAMBRIAN PART 2

PTYCHOPARIIDA
 

The Cambrian period, named for Cambria, an area in Wales, began 570 million years ago and lasted until 504 million years ago.  During this time major modern phyla of multicellular organisms appeared.  Probably descending from segmented worms, trilobites developed hard exoskeletons, eyes and the ability to grow by shedding their old shells.  They diversified and become the dominant life-form in the oceans.  Both the largest and the smallest trilobites lived during the Cambrian.    There were more families of trilobites during this era than at any other time.

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TO LEARN MORE ABOUT EACH ORDER OF TRILOBITES, CLICK ON ITS NAME.  THIS WILL TAKE YOU TO SAM GON'S WEBSITE FOR A DESCRIPTION.  USE YOUR BROWSER'S BACK BUTTON TO RETURN TO THIS PAGE.

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PTYCHOPARIIDA ORDER

Suborder: Ptychopariina

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Family: Ellipsocephalidae

1.6cm  Jince formation; Czech Republic

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Family: Marjumiidae    

2cm  Delta, Utah

  

4.5cm  Marjum Formation; Millard County, Utah

   

2.8cm Spence shale;  Liberty, Idaho

  

6mm  Wheeler Formation; Millard County, Utah

 

1.8cm  Marjum Formation;  House Range, Millard County,  Utah 

 

1.2cm  Weeks Formation; Millard County, Utah

6mm  Wheeler Shale; Millard County, Utah

  

4mm  Marjum Shale; House Range, Utah
 

1cm  Marjum Formation; Millard County, Utah

  

1cm Marjum Formation; Millard County, Utah

    

1cm Marjum Formation; Millard County, Utah
 

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Family: Ptychopariidae

 

8mm Wheeler Formation, Millard County, Utah

 

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Family: Asaphiscidae

3.6cm  Wheeler Shale; House Range, Millard County,  Utah

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Family: Conocoryphidae

5.4cm  Jince formation; Bohemia, Czech Republic

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Family: Proasaphiscidae

2.2cm  Suluda River; Anbar Region, Russia

1.2cm  Suluda River; Anbar Region, Russia

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Suborder: Olenina

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Family: Olenidae   

1.2cm  McKay Group; Cranbrook, British Columbia

  

1.9cm  McKay Group; Cranbrook, British Columbia

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To see the  Home Page

To see the   Cambrian Period Part 1: Agnostida and Redlichiida

To see the   Cambrian Period Part 3:  Asaphida, Corynexochida and Friends
To see the   Ordovician Period Part 1 Asaphida
To see the    Ordovician Period Part 2  Lichida, Phacopida, Corynexochida,  Ptychoparidia and Proetida
To see the   Silurian Period
To see the   Devonian Period Part 1 : Lichida, Corynexochida, Proetida and Harpetida
To see the   Devonian Period Part 2:  Phacopida.
To see the   Carboniferous Period, the Permian Period, some Trilo-trivia and Links