DIVISION EIGHT — SCIENCE. 571 



you classify it, in a tunnel recently run by me on the old Miguel White 

 place, subsequently owned by James Foord, and now in the possession of E. 

 K. Alexander. This place lies immediately east of the Winston rancho. 

 In this case it is largefy mixed with boulders, but ver)' little sand or gravel. 

 When taken out it forms a glutinous, plastic mass, and is exceedingly fine, 

 so much so that when mixed with water it will pass through any crevice 

 that that liquid will. This deposit lies about forty-six feet below the surface, 

 and is uptilted so as to render the ground back of it impervious ; in fact, we 

 seem to be passing through the side of a bowl into a basin filled with a 

 mixture of this clay and boulders. I found no fossils. The nature of this 

 material here suggests very forcibly the truth of your theory that it is a clay 

 formed by the grinding together of large stones. Very truly j^ours, 



Gervaise Purcell. 



In 1892 Hon. J. De Earth Shorb bored an artesian well in the upper 

 part of Mill canyon, at the foot of Lake Avenue. He kept a 

 record of the number of feet passed through of each different kind 

 of material and preserved a sample of the material each time, in a long 

 case of little glass-covered boxes. This case is preserved at his great winery 

 four miles south of Pasadena, where I spent the daj^ April 10, 1894, 

 examining its contents and giving name to each sample — for before this 

 they had remained unnamed ; the samples were there, with accompanying 

 figures, but no explanation or description whatever. And this is the first 

 and only complete geological section that I have learned of ever being pre- 

 served, out of all the scores of wells that have been bored or dug within 

 Pasadenaland. * It is of much value and interest to geologists and hydraulic 

 engineers, and also to any person who may contemplate sinking a well in 

 that region — hence I give it here : 



No. OF Feet in 



Samplk. ^1"^° o^ Material. Thickness. 



I. — Brown and gray fine gravel 11 



2. — Sandy clay 4° 



3. — Coarse gray gravel 16 



4. — Drab colored light clay — calcareous 13 



5. — Coarse gray gravel.. 29 



6. — Sandy clay 2 



7 . — Light colored gran ite 12 



8. — Brownish fine sandy clay 2 



9. — Brown sand and gravel i4 



10. — Light colored sand and gravel 8 



II. — Light snufF-colored sandy clay 6 



12. — Fine gray gravel and sand 12 



13. — Fine brown sand 6 



14. — Coarser gray gravel and sand 3^ 



15. — Brownish grit clay, slightly calcareous 2 



16. — Light and brown gravel with sand 22 



17. — SnufF-colored calcareous clay, with grit 6 



18. — Light colored fine gravel 6 



19, — Brownish grit clay, slightly calcareous..... 2 



20. — Coarse and fine light colored gravel 12 



Total depth 259 



*The looo-feet record given on page 552 was made over three years after this one by Mr. Shorb. 



