Materials Identification Guide

Tamaulipas Lithic Material

 











Name                    
Natural                                                  		 Non-heat treated points                                Heat treated points                               Color details                    Primary found in:     Associated             Formation / Member
Andesite
Generic Type		     North America Varies
Argillite
(Generic type)		   Light to dark green, but may range to various shades of gray North America  
Carnelian
(Generic Type)		   Translucent and varies in shades from reddish brown to reddish orange. North America Varies
Catahoula Petrified Wood   Includes petrified elm, oak, hickory, and palm wood and contains shades of white, brown, cream, and tan with wood grain or rings present. Northern Tamaulipas Catahoula Formation
El Sauz Chert   Predominantly light to medium gray may exhibiting mottling of pink, red, yellow, orange, purple, green and light browns.  Northern Tamaulipas Catahoula Formation
Palmwood
AKA: Petrified Palmwood
   Ranges from white to yellowish white or cream with specks or streaks of brown to yellowish brown.
 		Northern Tamaulipas Catahoula Formation
Petrified Wood
AKA: Agatized Wood, Opalized Wood		   Vary in color based on the minerals present during the process North America Varies
Rhyolite
(Generic Type)		   Gray to grayish black, flow banding may be present alternating from light to darker gray North America Volcanic Activity
Tuff
AKA: Solidified Volcanic Ash		   Contains greater than 75 volcanic ash and ranges from white to tan, gray or pink. North America Volcanic activity
Uvalde Chert
AKA: Twelvemile Creek Chert		   Ranges from most commonly from tan to brown with white, blue, gray, and pink cherts also occurring. Northern Tamaulipas Uvalde Gravels
Willis Chert Great variation of color, most commonly shades of brown and tan, but may range to white to pink or black.  Petrified Wood also occurs. Northern Tamaulipas Willis Gravel Formation