Mar., 1905. The Rodeo Meteorite — Farrington. 5 



the large amount of schreibersite visible in the sections, such a con- 

 tent of phosphorus would be expected. 



Including Rodeo, the meteorites now recognized from the State 

 of Durango are, with dates of their fall or find, as follows: 



Avilez, Spherulitic chondrite, Cc 1856 



Bella Roca, Fine octahedrite, Of 1888 



Cacaria, Hammond octahedrite, Oh 1867 



Rodeo, Medium octahedrite, Om 1852 



Rancho de la Pila, Medium octahedrite, Om 1804 



San Francisco del Mezquital, Siratik ataxite. Ds 1868 



The localities of these have been determined as accurately as 

 possible by the writer from various published accounts, and are 

 represented as determined on the accompanying map (Plate IV.). 

 Of these meteorites only one, Avilez, is a stone; the others are all 

 irons. Of the irons, Cacaria and San Francisco del Mezquital are 

 sufficiently distinguished by their structure, Cacaria being a Ham- 

 mond octahedrite and San Francisco del Mezquital an ataxite. 

 Rodeo and Rancho de la Pila are both medium octahedrites, but the 

 localities from which they come are about seventy miles apart. 

 Hence only Bella Roca needs to be compared with Rodeo in order to 

 determine whether it belongs to the same fall. The localities of 

 Rodeo and Santiago Papasquiaro, near which Bella Roca is said to 

 have been found, are in a direct line about forty miles apart. This 

 is much farther than parts of a single meteor could have been natu- 

 rally distributed according to our present knowledge. That they 

 might have been separated by human agency is possible, but not 

 probable, since the country between these localities is thinly settled 

 and difficult to travel over. From the appearance of the surface of 

 the Bella Roca meteorite Brezina concluded* that it could have 

 lain exposed but a little while. The Rodeo meteorite, however, 

 is known as far back as 1852. Brezina also describes Bella Roca 

 as a highly oriented individual showing an almost complete fusion 

 crust. Neither of these observations would apply to the Rodeo 

 iron. From the point of view of structure the two irons do not 

 differ essentially. The appearance of the lamellae is indeed quite 

 similar, with the exception that Rodeo has a preponderance of the 

 wider lamellae, sufficient, in the author's opinion, to warrant class- 

 ing it as a medium octahedrite. Bella Roca is classed as a fine 

 octahedrite by Brezina. There is also a similarity between the 

 two irons in the fact that the schreibersite inclusions follow the 

 octahedral lamellae, in their orientation. The schreibersite in Rodeo, 



* Wiener Sammlung, 1895, p. 271. 



