BULLETIN 39, UNITED STATES NATIONAL MUSEUM. 



[28] 



a blowpipe sometimes will stop decomposition entirely. Soaking in 

 vaseline sometimes will do the same. Another good method, which 

 seems to promise fair results, since the natural color of the sj)ecimen is 

 not changed, is one recently adopted in the department of minerals of 

 the National Museum by Mr. Wirt Tassin. This consists in varnish- 

 ing the specimen with a coat or two of "retouching varnish," a fluid 

 used by artists in fixing crayon pictures. 



PERMANENT LABELS AND PAPER TRAYS. 



The label and paper tray figured below is one in use in the !N'ational 

 Museum study collections. It will at once be seen that this label is 



never covered by the fossils, but is 

 always readily seen, while the label 

 on which the fossils rest gives addi- 

 tional space for short remarks when 

 such are deemed necessary. Paper 

 trays, in sizes which are multiples of 

 each other, are tlie best for holding 

 fossils for study and for private col- 

 lections. These should be of the fol- 

 lowing sizes, in inches : 2 by 3, 3 by 4, 

 4 by 6, 6 by 8 ; sides five-eighths of an 

 inch high, with the corners bound together with linen; the inside of 

 trays should be covered with smooth, glossy, white paper to prevent 

 the dust from adhering. 



APPENDIX. 



!Et4jari-K.aC:t;iJ: 



.._ _._ac.c-.Q^\,w&lIiji 



.CJi.oleaiu.. 



-,S.e,d.a.lici.'.Ulo^.., 



Fig. 13.— Paper tray. 



LIST OF SOME IMPORTANT LOCALITIES FOR FOSSILS IN NORTH AMERICA. 



Only such localities as are known to yield well-preserved fossils in 

 comparative abundance are given. Historic or important geologic 

 localities are not noted unless yielding good fossils. The exact position 

 of loca^ties is not indicated, only the nearest town; but the outcroj)- 

 ping rocks will be easily found if directions, given under the heading 

 ^^ Localities neiv to the collector''^ (page 9), are followed. Localities are 

 arranged geologically under systems, beginning with the oldest (0am- 

 Tjriau) and ending with the Post-Pliocene. 



CAMBRIAN. 



Lower Cambrian. — Troy, Schodack Landing, Washington County, 

 N. Y. ; Parker's Quarry, near Georgia, east of S wanton, Vt.; York, Pa.; 

 Coosa valley, Ala. ; Eureka district and Pioche, l^ev. 



Middle Gamhrian. — St. Johns, New Brunswick; Coosa valley, Ala. ; 

 Mount Stephan, British Columbia; Eureka district, Nev.; Antelope 

 springs. House range, Utah. 



Upper Gamhrian {in places also Middle Cambrian). — Near Saratoga, 

 N. Y.; Prairie du Sac, Trempealeau, Menomonie, Eau Claire, Hudson, 



