074 DILLION, W. P., and OLDALE, R. N. 1978. "Late Quaternary Sea-Level 

 Curve: Re- interpretation Based on Glacio-Tectonic Influence," Geology . Vol 6, 

 pp 56-60. 



High-resolution seismic-reflection profiles obtained between Chesapeake 

 Bay and Long Island along 2,500 km of trackline appear to show tilting of a 

 large lithospheric block within the United States eastern continental margin. 

 This warping probably was related to glacial loading and unloading. It has 

 resulted in postglacial changes in depth at locations where radiocarbon-dated 

 samples have been obtained and thus has affected the eustatic sea- level curves 

 deduced from these samples. Corrected values indicate significantly shallower 

 depths in the older (deeper) parts of the United States east coast curve and 

 thus a revised estimate of global sea- level lowering during Wisconsinan time. 

 (Authors) . 



075 DOMINGUEZ, JOSE M. L. , MARTIN, LOUIS, and BITTENCOURT, ABILIO C. S. P. 

 1987. "Sea-Level History and Quaternary Evolution of River Mouth-Associated 

 Beach Ridge Plains Along the East-Southeast Brazilian Coast: A Summary," 

 Nummedal, D., Pilkey, 0. H., and Howard, J. D., eds . , Sea-Level Fluctuations 

 and Coastal Evolution . Special Publication No. 41, Society of Economic 

 Paleontologists and Mineralogists, Tulsa, OK, pp 115-128. 



The record of recent sea-level variations for the east-southeast 

 Brazilian coast is characterized by a maximum height of 5 m above present sea- 

 level about 5.1 ka . Sea- level fall from that highstand was interrupted by 

 high-frequency sea-level oscillations as large as 2-3 m acting on time scales 

 of no more than 200-300 years. This sea-level history had a profound effect 

 on the evolution of sedimentary plains associated with the mouths of the major 

 rivers emptying onto the east-southeast coast of Brazil. 



During the 5.1 ka highstand these plains were drowned and barrier 

 island- lagoonal systems associated with intralagoonal deltas were the dominant 

 environments of deposition. During the subsequent drop in sea-level, 

 conditions for the genesis and maintenance of barrier island- lagoonal systems 

 were highly unfavorable. The coastline rapidly prograded, giving origin to 

 regressive sand sheets. 



In the Jequitinhonha River beach-ridge plain, the short-term Holocene 

 sea- level rises caused drowning of the river mouth and induced abrupt shifts 

 in the lower river course. In the Doce river beach-ridge plain, these same 

 events resulted in the formation of new barrier island- lagoonal systems as 

 well as reoccupation of old lagoons by the sea. The main sources of sediment 

 for the progradation of the coastline were provided by wave -induced longshore 

 drift of sediments made available through reworking of the inner shelf via 

 falls in sea-level. 



These data, derived from study of the Brazilian coast, strongly suggest 

 that sea- level history during the Holocene was a dominant factor in 

 controlling styles of sedimentation around the coastlines of the world. 

 (Authors) . 



37 



