significantly from the hypothesis that sea-level rose 2-4 m above its present 

 position during this time. The Florida submergence data also do not support a 

 strict interpretation of the stable sea-level hypothesis, i.e., that sea-level 

 reached its present position (and maintained it) sometime between 3000 and 

 5000 years ago. (Authors). 



312 SCHWARTZ, M. 1965. "Laboratory Study of Sea-Level Rise as a Cause of 

 Shore Erosion," Journal of Geology . Vol 73, No. 3, pp 528-534. 



In contrast to classic concepts of the relationship of sea-level change 

 to shore erosion, Per Brunn has proposed a new theory giving dimensional 

 relationships to the process. To make a preliminary test of the validity of 

 the theory, a small-scale model study was conducted, using constant beach and 

 wave characteristics under variable conditions of water level rise. Equili- 

 brium was rapidly established with erosion and deposition taking place as 

 predicted by Brunn. (Author) . 



313 SCHWARTZ, M. L. 1967. "The Brunn Theory of Sea-Level Rise as a Cause 

 of Shore Erosion," Journal of Geology . Vol 75, No. 1, pp 76-92. 



Laboratory and field tests have been undertaken in order to test the new 

 theory proposed by Brunn which offers dimensional relationships to the process 

 of sea-level rise as a cause of shore erosion, in contrast to the classic 

 Johnsonian concept. Brunn holds that when an equilibrium profile is 

 developed, (a) there is a shoreward displacement of the beach profile as the 

 upper beach is eroded, (b) the material eroded from the upper beach is equal 

 in volume to the material deposited on the nearshore bottom, (c) the rise of 

 the nearshore bottom as a result of this deposition is equal to the rise in 

 sea-level, thus maintaining a constant water depth in that area. 



In field investigations, the variation between neap and spring low tide 

 was utilized as a short-term model of sea-level rise in obtaining profiles on 

 two small-scale wave basins in coordination with the beach surveys. First 

 order determinations, based on combined field and laboratory data, affirm the 

 Brunn theory of predictable shore erosion following a rise in sea- level. 

 (Author) . 



314 SCHWARTZ, M. L. 1972. "Seamounts as Sea-Level Indicators," Geological 

 Society America Bulletin . Vol 83, pp 2975-2980. 



Terraces on Cobb and Bowie Seamounts , with shelf breaks at 120 and 

 140 f ms . respectively, are believed to have been wave cut during the 

 Pleistocene. Terrace bathymetry plus polished and rounded pebbles obtained in 

 grab samples from these terraces support a wave abrasion genesis. As the sea- 

 mounts were formed during the Cenozoic the continually descending lows of sea- 

 level fluctuations through the Tertiary and Quaternary would suggest a late 

 Pleistocene origin for both of the terraces. Upon consideration of possible 

 hypotheses for the virtual doubling of the presently known 130-m Wisconsin 



145 



