6 T. G. HALLE, MESOZOIC DEPOSITS AND FLORAS OF PATAGONIA AND TIERRA DEL FUEGO. 
Plant-bearing deposit at Bahia Tekenika, Tierra del Fuego. 
Geology. 
Bahia Tekenika is a large bay or fiord cutting into the almost isolated eastern 
portion of Hoste Island. The locality in which the fossils were collected is situated 
on the southern shore of the bay, about 60 naut. miles N.W. of Cape Horn. During 
the Swedish Antarctic Expedition with the »Antarctic> in 1901—1903, Professor J. 
G. ANDERSSON (1908, p. 174) had discovered here, close to the now abandoned mis- 
slion-station, a fossiliferous deposit of highly disturbed conglomerate and greywacke 
containing slices and lenticular bodies of coal. 'The fossils consisted of petrified wood 
and marine shells, principally mussels, which were scarce and mostly fragmentary. 
The collections made on this occasion were kept on board the »Antarctic> and were 
afterwards lost with her. 
In March 1909 I found an opportunity of spending a couple of days at Teke- 
nika. New collections of the shells and the petrified wood were made; and in addi- 
tion I found some few and badly preserved plant-impressions. The wood and the 
shells have unfortunately not yet been examined by specialists, but the impressions, 
poor though they are, appear to be sufficient for a rough determination of the age 
of the deposit. 
Text-fig. 1 is a sketch-map of Bahia Allan Gardiner (at which the mission-sta- 
tion was formerly situated) on the S. side of Bahia Tekenika. On this sketch-map, 
which is drawn on the basis of the Chilean Admiralty Chart, the principal exposures 
of solid rock are laid in, in order to show the prevailing strike of the strata as well 
as the different places in which the fossils were found. The principal exposure is 
on Peninsula Burleigh between Punta Carbön and Punta Fösil, as well as for some 
distance west of the latter. It was in this locality that Professor ANDERSSON had 
studied the coal and collected the petrified wood and the marine shells. The pre- 
vailing rock is here a very hard conglomerate with fairly large, rounded pebbles. The 
conglomerate is intercalated with a very hard, somewhat gritty slate. The same 
kind of rock also appears to form the matrix in the conglomerate. 'The coal, which 
is of a very poor quality, was first discovered by a Chilean man-of-war at the point 
which is named after it Punta Carbön. It occurs as thin lenses and slices of small 
