332 E. W. Hilgard—Geological Reconnoissance of Louisiana. 
main features of the geology of the whole of Louisiana. The 
unexplored territory will probenty before the end of the season, 
have been eel by Profs. Lockett and Hopkins, of the 
Louisiana State Seminary at Alexandria, in pursuance ie a small 
provision made for the purpose by the last legislatur 
Before proceeding to details it may be wel Il to regal briefly, 
the results communicated at the last meeting, of my examina- 
tion of the formations of Lower Louisiana. I then stated that 
the southern . of the main body of the Orange Sand or 
southern Drift, extends but little south of the limit of the 
Grand Gulf Sep. ahs latest (fresh-water) Tertiary of the Gulf 
coast; that, nevertheless, in the direction in which the main 
pebble- stream, coincident with the axis of lowest depression of 
the Mississippi valley would strike the Gulf, we find a chain of 
elevations, formed, apparently, by a nucleus of outliers of the 
ae Sand materials, surrounded and overlaid by those of the 
eceeding swamp, lagoon and estuary formation, which from 
Oty prominent development at Port Hudson, I have designated 
as the Port Hudson group; its geological horizon lying between 
that of the Orange Sand, and the Loess or Bluff formation. I 
also stated that the deposits of this age extended at least from 
the Sabine River to Mobile Bay. In fact, I then suspected, and 
am now confirmed in the opinion, that most if not all the de- 
am provisionally thrown together under the head of “Coast 
liocene,” on my “hap hase ae of Mississippi, are the equiva- 
lents the Port Hudso: 
ort Hudson gr fig mast of the iu leat river, the 
east of the river, the eral slo here a oe to 
the Port ie Bist bl hay sp i hy, 
ogee 2 upon the ba Lo enenig below and dete Opelousas, 
ve given to ve ns the seemingly inap "i 
names of “Cédte ag = « “Grand Céteau fine Opel usas 
which are descriptive of the appearance when ‘first ap, 
* Miss. Rep., p. 368. 
