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p 
Ill 
Alluvium 
Silt, clay, and 
th1n 1 
discontinuous 
beds of sand and gravel . Includes 
beach sand. Estimated maximum 
thickness 30 ft 
■ 
K1ngshill Marl 
A 
11_.., 
Limestone, sandy limestone, and coral 
deposits alternating with marl. Maximum 
thickness 
at least 600 ft. 
Figure 3.--Generalized geologic map of St. Croix. 
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Jealousy 
Formation 
Predominantly bluish-gray clay. 
N 
A basal calcareous conglomerate 
makes the only known outcrop . 
1 
Maximum thickness at least 1,400 ft .: 
3 miles 
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64° 35' 
BUCK IS. 
~ 
EA 
+ 
Geology 
mod1f1ed after D. J. 
Cederstrom, 1939, 
and J. T 
Whet ton, 
1961. 
Intrusives 
Gabbro and miscellaneous, dark-
colored crystalline rocks 
Mount Eagle Volcanics 
Mudstone, siltstone, and 1nterbedded 
water-laid tuff. Thickness at lea,st 
30,000 ft. 
Inferred fault 
Dotted where 
concealed . 
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