84 



GULF TERTIARY OF TEXAS. 





© 



a 



d 





0T3 





>>G 



S . 





o 









Pi 



o5 



a 

 3 







S'S 



Pm 



3 



H 



3? 

 3 



1*. . . 



59.86 

 68.80 



















41.90 



2*... 



3.40 



Trace 



Trace 





13.36 



13.70 



0.12 



99.38 



48.16 



3 1 





73.60 



9.89 





Trace 





10.06 



6.75 



Trace 



100.30 



51.52 



M 





57.09 



12.56 





Trace 





15.33 



15.05 



Trace 



100.03 



39.96 



5] 





67.84 



8.16 





Trace 





9.64 



14.69 



Trace 



100.33 



47.49 



6*... 



59.20 



11.20 





Trace 





16.20 



13.45 



Trace 



100.05 



41.44 



7+... 



60.35 



4.24 



Trace 



0.33 





25.13 



9.24 



0.26 



99.55 



42.25 



8*... 



39.78 



8.42 



Trace 



1.06 



0.18 



40.40 



9.50 



31 



99.65 



27.85 



9*. .. 



44.98 



6.82 



Trace 



2.27 



0.02 



36.70 



9.70 



0.16 



100.65 



31.49 



10*... 



66.09 



6.91 



Trace 



1.81 



0.37 



11.85 



12.40 



0.28 



99.71 



46.26 



11+.. . 



42.84 



7.86 



Trace 



2.10 



1.04 



40.60 



6.10 



Trace 



100.54 



29.99 



12+- 



48.65 



12.65 



Trace 



2.30 



0.26 



26.07 



10.30 



Trace 



100.23 



34.06 



13*... 



68.23 



5.17 



Trace 



0.86 



0.34 



14.50 



10.20 



0.57 



99.87 



47.76 



14*... 



80.78 



2.22 



Trace 



0.88 



0.02 



4.30 



10.47 



0.38 



99.05 



56.55 



15* 1 .. 



76.42 



6.20 



Trace 



1.13 



0.61 



3.10 



9.90 



0.22 



100.19 



53.49 



16* .. 



67.93 



7.07 



Trace 



1.57 



0.18 



8.92 



14.40 



0.32 



100.39 



47.55 



It*... 



84.15 



2.05 



Trace 



0.94 



0.22 



1.22 



12.20 



0.19 



100.97 



58.90 



18+.. . 



65.79 



8.31 



Trace 



2.30 



36 



18.77 



5.05 



Trace 



100.48 



46.05 



19* 5 .. 



57.25 

 64.30 



30.634 

 10.70 



0.805 



1.235 

 1.06 



1.45 



8.18 

 15.40 







100.119 

 99.40 



40.08 



20*... 



7.70 



0.24 



45 01 



21*... 



64.32 



13.18 





Trace 



Trace 



8.70 



14.10 



Trace 



100.30 



45.02 



22+ 5 .. 



48.96 



4.54 



Trace 



2.10 



0.31 





7.25 







34.27 



23* 2 .. 



45.30 

 66.10 



17.04 

 8.20 





15.68 

 Trace 





6.91 

 10.79 







97.25 

 99.36 



31.71 



24+. . . 



14.27 



Trace 



46.27 



25* 5 .. 



59.74 



23.41 



1.185 



0.515 



1.863 









99.133 



41.82 



26*3 5 



74.115 



16.505 



1.765 



1.040 



0.933 



1.492 





0.122 



98.085 



51.88 



2*7* .. 



26.27 



6.73 



1.05 





1.55 



53.20 



11.23 





100.00 



18.39 



28* 5 .. 



44 . 805 



18.495 



4.415 



0.560 



4.40 



18.425 



8.73 





100.00 



31.36 



29* 5 .. 



69.75 



8.70 



0.235 





1.99 



6.975 



12.153 





100.00 



48.83 



30* 4 .. 



43.67 

 20.46 

 61.20 









0.0213 



11.40 









30.57 



31*... 















14.32 



32+... 



1.10 





Trace 



Trace 



27.33 



10.57 



Trace 



100.20 



42.84 



33+... 



79.06 



0.69 





1.50 



Trace 



6.04 



12.68 



Trace 



99.97 



55.34 



34+. . . 



65.79 



19.96 





Trace 



Trace 



0.93 



13.90 



Trace 



100.58 



46.05 



35+... 



60.44 



19.56 





Trace 



Trace 



6.77 



12.95 



Trace 



99.72 



42.31 



36* e .. 



64.42 

 28.22 

 60.05 

 63.75 

 12.21 

 27.91 



3.816 



1.014 



0.284 



1.838 



26.435 



48.975 



24.48 



20.40 



74.35 



47.10 







99.702 



45.09 



37*. .. 







19.75 



38*... 





...... 





42.04 



39*. . . 











44.63 



40*. . . 













8.55 



41*... 











19.54 























* Analysis by J. H. Herndon. 



f Analysis by L. Magnenat. 



1 Ferrous oxide, 2.61. 2 Carbonic acid, 12.32. 3 Potassa, .364; soda, .485. 4 Insoluble residue, 33.50. 



5 Oxide of manganese; No. 19, 0.565; No. 22, 1.20; No. 25, 0.420; No. 26, 0.1264; No. 28, 0.170; No. 29, 0.147; No. 36, 



BENCHES. 

 The existence of benches on the slopes of the iron ore hills has been re- 

 ferred to in several places, and requires some explanation. They are of very 

 common occurrence, and form a marked feature in the topography of the 

 country. Sometimes as many as five or six of these are seen in a vertical 

 distance of 100 feet, and run out from the side of the hills* to a distance of 



