270 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I4O 



I and 2; 15, figure I ; 25; 28, figure 2; 29; 30, figures i and 2 ; 31, 

 figures I and 2; 33; 34; 35. figure i. 



Distinctive configurations in a short sequence of growth layers have 

 been called "signatures" (Douglass, 1934, p. 3; 1937, p. 13) or 

 "fingerprints" (Douglass, 1931, p. 309; 1936, p. 10) and as such are 

 considered a means of identification. One such signature on display 



Fig. 45. — Diagrammatic radial sequence adapted from the "signature" used as 

 a cover emblem of the Tree-Ring Bulletin. Each growth layer here shown has been 

 assigned an annual date. Compare with figure 46. 



Fig. 46. — "Fingerprint" or "signature" embodied in the growth layers of XSC 

 i2-i-a. Proved dating shows each growth layer not necessarily an annual. Compare 

 with figure 45. 



is the one reproduced in part in text figure 45, which served as an 

 emblem of the Tree-Ring Bulletin. The emblem, taken from "Early 

 Pueblo Dating," has been dated (Douglass, 1940, folded plate) as 

 A.D. 422 to 432. Figure 45 should be compared with text figure 46, a 

 specimen dated with absolute accuracy. In the work on TTC, TTP, 

 and XSC, characteristic configurations have repeated themselves mo- 

 notonously. XSC i2-2-a, cut December 6, 1941, gives the following 



