CONTENTS 



FIGURES--Continued 



Page 



6 A vibratory core rig, used to obtain 34 cores with a maximum 



length of 6.1 meters 15 



7 The jack-up barge, Lim Bowman^ used as the platform for 



coring during phase II of data collection 16 



8 Location of seismic reflection ship tracklines and vibratory 



cores taken between High Island and Freeport 19 



9 Generalized geologic map of Quaternary-age sediments in the 



Galveston-Brazoria County region of the Texas gulf Coastal 



Plain 25 



10 Sea level changes on the Texas coast during the past 100,000 



years correlated with geologic events ..... 26 



11 Modern environments and facies on the Galveston barrier island . 29 



12 Geologic cross sections at Galveston showing the Pleistocene 



unconformity, Holocene stratigraphy, and the configuration 



of the ancestral Trinity Channel . 30 



13 The four primary sediment types on the inner shelf surface, 



determined from the CERC cores and seismic records and from 



TBEG grab samples 33 



14 Mean grain-size diameter for native beach sands along the Texas 



coast from the Sabine River to Surfside Beach 37 



15 Map of five sites selected as possible locations for obtaining 



sand for beach nourishment 39 



16 Possible borrow area A, which is confined to a relict buried 



stream channel cut into the Pleistocene erosion surface .... 42 



17 Map of possible borrow site B, and site C which has a high 



potential inshore area , 43 



18 Borrow area D, which consists of the San Luis ebb tidal shoal 



and adjacent shoreface 45 



19 The sedimentary facies and different environments associated 



with San Luis Pass, which result from complex ebb and flood 



tidal processes 46 



20 Quaternary stratigraphy at San Luis Pass based on 



interpretations of descriptive logs of 16 borings 47 



21 Borrow area E off Surfside Beach at the west end of the 



survey area .................... 48 



