62 FLORIDA GEOLOGICAL SURVEY-SEVENTH ANNUAL REPORT. 
Evidence of an unconformity is seen in these pits between Nos. 
3 and 4 of the sections. The material above the break is a coarse 
conglomerate consisting of phosphate pebble, water-worn flint peb¬ 
ble, bone fragments and worn corals. Immediately on the contact 
line is found a considerable amount of worn coral, some pieces of 
which were estimated to weigh as much as eight or ten pounds. 
At no other place in the phosphate beds are worn corals so numerous 
or so large as at this locality. 
The phosphate matrix of No. 4 beneath this break contains much 
clay and is chiefly of a bluish color which upon exposure oxidizes 
to a light buff yellow. Occasional bones and flint pebbles are found 
also in this part of the formation. The water worn corals, however, 
were not observed below the unconformity. That part of the phos¬ 
phate matrix below the break in deposition contains also much clay 
and many rounded pieces of soft phosphate while that above the 
unconformity contains hard pebble rock only. 
This unconformity may be purely local and due merely to the ac¬ 
tion of tides or of streams in the shallow waters which after wash¬ 
ing out a part of the phosphate bed, reaccumulated coarser material 
in the depression. It seems probable, however, that the uncon¬ 
formity, together with the observed fact that coarse conglomerate 
Fig 6.—Section in pit No. 1 of the Coronet Phosphate Company showing 
unconformity in the phosphate bed. (1) Soil and incoherent surface sand. 
(2) Somewhat indurated phosphatic gray sands, grading below into (3) a 
coarse conglomerate of phosphate pebble, worn bones, flint pebbles and silicified 
corals. (4) Phosphate bed containing sand, clay and phosphate pebble. (5) Bed 
rock marl. An unconformity is found in this section within the phosphate bed 
between (3) and (4), as well as at the base of the phosphate bed between (4) 
and (5). 
