The laboratory's current projects include 1) dating and assessing stratigraphic integrity at paleoindian sites in North and South America; 2) dating rock structures such as tipi rings and drive lines; 3) dating earthen structures such as canals, mounds and adobe buildings; and 4) building ceramic chronologies.
Methodologically, the laboratory specializes in single-grain dating of quartz and feldspar, particularly in the ability to identify post-depositional mixing and partial bleaching.
Please contact me by email or check the laboratory web site (hhtp://depts.washington.edu/lumlab/) for further information.
I am also interested in prehistoric ceramic technology, although I am not involved in active research in this area at present.
Follow My 40 Day Pottery Challenge Pottery Videos Tools for Pottery Tips & Techniques for Pottery and Ceramics Clay Pottery Craft Projects Clay Pottery Articles of Interest Old Time Pottery History Pottery and Ceramics Featured Potters Gallery Pottery and Ceramics Definitions All About The Clay All About Pottery Glazes Fascination With Pottery Differences Between Pottery and Ceramics Identifying Pottery Treasures Pottery Identification Dating Pottery Types Of Pottery Selecting Pottery Supplies Works of Famous Potters Pottery and Ceramic Hangtags Registration Marks Ceramic Lose United States Pottery Marks A Thru C United States Pottery Marks C Thru L United States Pottery Marks L Thru R Pottery and Ceramic Trademarks Some Things I Wish I Had Done From The Start! Pottery Signature Stamps Recognizing Pottery Defects Planting Your Pottery Incredible Paperclay Choosing the Perfect Pot Fired Arts, Find Out More The Legend of the Willow Plate The Willow Poem Facination with Horsehair Ceramic Earthenware Pottery Care Pottery Photography Therapeautic Pottery for Children Landscaping with Pottery From 1842-1883 English items carried a diamond shaped mark which could be read to decipher the actual day a pattern was registered.
After 1884 the registry went to a single number series such as Rd. 12342, which can be used to determine the pattern registration date to within approximately one year.
To the collector the mark has greater importance, for not only can he trace the manufacturer of any marked object, but he can also ascertain the approximate date of manufacture and in several cases the exact year of production, particularly in the case of 19th and 20th century wares from the leading firms which employed private dating systems.
With the increasing use of ceramic marks in the 19th century, a large proportion of English pottery and porcelain can be accurately identified and often dated.
The presence of zinc is justified because of the physical and chemical properties it imparts to the enamels.
To a lesser degree, the laboratory is studying application of pulsed lumniescence.
The laboratory runs a dating service for outside clients, providing dates for sediments, ceramics, lithics and fire-modified rocks.
Some general rules of using marks for dating pieces include the following: The word Limited or an abbreviation like Ld. in the pottery firm's name indicates a date after 1860 and was not generally used until the 1880's.
Any piece having the word Trade Mark was manufactured after the Trade Mark Act of 1862 and the words generally denote manufacture after 1875.