types of the area is rare in Type D sands, as are barnacle plates which 

 occur in quantity in Types A, B, and C sediment. 



Type E material is characterized by its white or very light gray 

 color. This material is highly variable in size and in its degree of 

 lithification (Figure 20). In typical cores, layers of lithified and semi- 

 lithified material are interspersed with sediment layers. Many of the 

 unlithified layers contain granules and pebbles of calcarenite probably 

 weathered or redeposited from the lithified layers. 



The size range of Type E material varies from silty calcareous clay 

 to coarse calcareous sand, shell gravel and pebbles. Most of the sand- 

 size material is biogenic. Fragmentation of the skeletal sand-size 

 material is usually well advanced and identifiable fragments are sparse. 



Indurated Type E rocks appear in cores in the form of layers or 

 discrete pebbles and angular fragments mixed with unconsolidated sedi- 

 ments, generally similar to that comprising the indurated material. 

 Indurated fragments obtained from cores on the outer shelf consist of 

 white medium- grained calcarenite containing shell fragments, foraminifers , 

 quartz, and many oolitic or pelletoid grains. Individual grains are 

 frequently well worn, and many are polished. Cementation occurs only 

 at points of grain contact, and there is little if any infilling of 

 interstices . 



Type E material occurring in cores of the inner shelf is more 

 variable. In places it consists of white calcareous silty or sandy clay 

 which dries to a very hard rocklike substance. Other E sediments and 

 indurated material from the inner shelf generally are light gray or tan, 

 and the indurated material is finer grained, denser and more compact than 

 that from the outer shelf area. Redeposition of calcium carbonate in 

 interstices appears to have accounted for greater density although grain 

 size and sorting may be equally important. 



It is difficult in most cases to determine if indurated fragments in 

 Type E material are the result of the coring tube penetrating lithified 

 layers or if the fragments are redeposited from a higher source. In a 

 few cases, a solid plug of rock in the core is evidence of penetration of 

 an indurated layer. Angular "fresh" appearing fragments also evidence the 

 breaking up of a layer by penetration of the corer. Occasional rounded 

 pebbles of calcarenite are probably redeposited. 



Type E sediments are most variable in terras of coarse constituents. 

 Fragments of calcarenite, rare in other types, are common. Mulinia 

 lateralis and Glycymeris pectinata are the most common pelecypods. 

 Crepidula fornicata is common, as are fragments of other species of 

 gastropods. Barnacle plates are absent in some samples and abundant in 

 others. Skeletal fragments are for the most part white - or near white - 

 often worn and occasionally partly embedded in calcareous material. 



39 



