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BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
beds. Streams flowing consequent upon the initial slopes of the 
gravels have been and are being beheaded and diverted by the active 
subsequents, while newly formed tributaries, flowing down the steep, 
infacing slope of the upturned, eastward-dipping beds, are following 
a course directly opposite to that of the initially consequent streams. 
Such streams have been termed “obsequent” by Davis (a, p. 134). 
The retreat of what may be called the obsequent slope is uncovering 
lower beds on which new streams are forming, tributary to the sub- 
T= Terrace 
Sh = Shoulder O=Obsequent 
S= Subsequent 
R = Resequent 
BC=Beheaded 
DC=Diverted 
C=C t 
) Consequent Ba 
Fia. 8. Diagram to illustrate drainage relations in the Bighorn district. 
sequents and having a consequent direction, though in this case that 
direction has been resumed after an interval in which that portion of 
the slope has been occupied by obsequent drainage. Such streams 
have been named by the same writer (c, p. 629) “reconsequent” or 
“resequent.” Examples of some or all of these types of streams are 
to be found at various places along the east flank of the mountains. 
Big Goose Creek. A particularly fine locality (diagrammatically 
