436 BOAVEX AXD AUROUSSEAU FUSIOX OF SEDIMENTARY ROCKS 



Table I. — Chemical Analyses of Core from Montezuma ^\'ell 



1 2 3 45G78 9 



Percentage 

 Differences differences 



Unfused Fused Fused Unfused Fused + — + — 



SiOj 61.72 64.17 64.40 61.76 61.76 



AI2O3 17.05 17.12 17.18 17.07 16.48 0.59 (4) 



FGoOs 1.48 none none 1.48 none 1.48 100 



FeO 2.64 6.50 6.5.3 2.64 6.26 3.62 137 



Fe 0.46 



MgO 1.54 1.52 1.52 1.54 1.46 0.08 (5> 



CaO 3.00 3.36 3.38 3.00 3.24 0.24 (8) .... 



Na,0 3.28 3.41 3.42 3.28 3.28 



K2O 2.09 2.21 2.22 2.09 2.13 0.04 (2) 



H,0+ 2.00 0.24 0.24 2.00 0.23 1.77 88 



H2O— 3.47 0.02 0.02 3.48 0.02 3.46 99 



CO2 0.65 none none 0.65 none 0.65 100 



TiOa 0.58 0.62 0.62 0.58 0.59 0.01 (2) 



PoOs 0.21 0.28 0.28 0.21 0.27 0.06 (30) 



S 0.14 0.06 0.06 0.14 0.06 0.08 57 



Cr^Os trace trace trace trace trace 



MnO 0.06 0.07 0.07 0.06 0.07 0.01 .... (17) 



BaO 0.07 0.08 0.08 0.07 0.07 



Sum 99.98 100.12 100.02 100.05 95.92 3.98 8.11 



Less 05 .02 .02 .05 .02 03 



Sum 99.93 100.10 100.00 100.00 95.90 8.08 



95.90 3.98 



Percentage change on fusion — 4 .10 — 4 . 10 



1. Unfused Eocene (Tejon) sediment from core taken in Montezuma well, 

 near Suisun. Solano County, California. M. Aurousseau, analyst. 



2. Fused portion of core. M. Aurousseau, analyst. 



3. Fused portion of core from (2) by deducting metallic iron and reducing 

 to 100. 



4. (1) calculated to 100. 



5. Amount of each oxide associated with 61.76 grams of SiOo in fused ma- 

 terial calculated from (3). 



6. Positive differences. 



7. Negative differences. 



8. Positive percentage differences from amounts in original sediment. 



9. Negative percentage differences from amounts in original sediment. 



Chemical Effects of Fusion 



The analyses of the fused and unfused portions show very remarkable 

 correspondence. • There can be no doubt of the identity of the fused plug 

 with the unfused sediment immediately overlyino- it, nor can there be 



