84 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
of soft beds, coincides with the dip of the limestone, except near the 
bottom, where the latter has been removed and the slope is steeper. 
The subsequent stream in the Red Canyon is working actively, during 
the moister seasons, on a slope of about seven hundred feet to the 
mile and is reaching headward toward Diamond Creek, its next 
consequent neighbor to the southeast. The uncut strip between 
the two streams is scarcely more than a quarter of a mile wide and the 
decapitation of Diamond Creek may be said, geographically speaking, 
to be imminent. 
Beheaded Streams. The threatened fate of Diamond Creek has 
already overtaken an unnamed, minor consequent, which joins Big 
Goose Creek about two miles and a half below the Red Canyon. The 
diverted portion of the beheaded stream, which cuts rather sharply 
into the mountain side, because of the steeper slope and shorter course 
permitted by the capture, joins the subsequent at nearly a right angle 
and forms, according to the map, the headwaters of that stream; but 
in the field the canyon is seen to be continuing its headward growth 
along the strike of the rocks, ready for further piracy. On the eastern 
rim of the canyon, opposite the elbow of capture, is a well preserved 
rounded notch that gives a sharply defined cross section of the former 
consequent valley, which may be clearly seen, following a somewhat 
irregular course down the slope eastward. This valley was cut by an 
insignificant stream that did not incise its channel deeply; but it is 
worthy of description as a fine example of the class of beheaded con- 
sequent streams, for it is engraved upon the slope with diagrammatic 
clearness. Other minor consequent gulches, originating farther down 
the slope, would not at first sight be considered as members of the class 
just mentioned; but since ground water, which might otherwise con- 
tribute to their maintenance, is intercepted by the subsequent; and 
since, on account of the presence of the subsequent, they are forever 
debarred from extending their headwaters beyond it into the upper 
portions of their rightful drainage basins, they are as truly beheaded, 
in the sense of having lost part of their drainage area, as are those 
streams where actual capture has occurred. 
Obsequent Gashes. Within the red canyon obsequent gashes occur 
here and there on the east wall. In only one case observed by the 
writer had the cutting progressed sufficiently to develop even a puny 
trickling stream. The immaturity of the subsequent, which is still 
engaged in down cutting and monoclinal shifting, is doubtless respon- 
sible for the present embryonic condition of the obsequent drainage. 
It is probable, too, that on account of the strong eastward dip of the 
