A FACIES DESCRIPTION AND HOLOCENE HISTORY OF THE NUECES BAY-HEAD DELTA, TEXAS
Nueces bay is located in central Texas along the Gulf of Mexico. The Gulf of Mexico has experienced increasing sea-level rise during the Holocene even when accounting for glacio-isostatic adjustment. The early Holocene sea-level rise was punctuated by two rapid rates of increase, known as high-stands. The Gulf of Mexico has experienced a relatively steady increase in sea-level for the past 5 ky. The main contributing factor to change in the estuaries in the southern and central Texas Gulf Coast has been climate change during this period. Six geoprobe cores and thirty-one vibracores have been described and the descriptions used to make facies correlations from the front of the delta to approximately 12 km inland. Additionally, 4 km of seismic data were collected in the bay itself and within the distributary channels. Radiocarbon dating was used to constrain the timing of deposition. Four distinct have been defined based on relative grain size and type of fauna. The correlated defined facies have been used to characterize the delta front architecture. Interpreted seismic data indicates progradation sequences and channel migration sequences during the delta’s past.