. The geography of Texas, physical and political. The water waysare but a few feet below the general level, and betweenthem there are many swampy intervals. It is an excellentexample of a recently formed plain. Deltas. The effects of recent stream building are ap-parent at several points along the coast, giving rise todelta shore waste of the RioGrande has produceda marked outwardencroachment uponthe waters of theGulf, and the com-bined action of theColorado and Brazosrivers has given riseto a similar thoughnot so conspicuousresult. The Trinityriver, which emptiesinto Galveston bay,h
. The geography of Texas, physical and political. The water waysare but a few feet below the general level, and betweenthem there are many swampy intervals. It is an excellentexample of a recently formed plain. Deltas. The effects of recent stream building are ap-parent at several points along the coast, giving rise todelta shore waste of the RioGrande has produceda marked outwardencroachment uponthe waters of theGulf, and the com-bined action of theColorado and Brazosrivers has given riseto a similar thoughnot so conspicuousresult. The Trinityriver, which emptiesinto Galveston bay,has formed a truedelta with distribu-taries. So great is the accumulation here that the delta deposits now extendnearly across the head of the bay, cutting off a body ofwater called Turtle bay, as shown in Fig. 8. Peninsulas and Islands. The conflict between the sea andthe land has given rise to the long narrow peninsular andisland ])arriers fringing the Gulf coast of the state, so admira-bly exemplified in Matagorda peninsula and Padre Fig, 7. Delta Shore Lines of theTexas Coast 18 THE GKOGRAPHY OF TEXAS The waste brought down by the larger rivers is now, asin the past, extending the Coastal plain seaward. On theother hand, the prevailing winds and waves, assisted bycurrents and, it may be, by tides, are resenting the inva-sion, forcing back the sand and silt, and molding them intotheir present forms. Between these barriers and the olderland are included bodies of shallow water known as lagoons Delta Deposits Low Ground with Vegetatioa Sandy Deposits Shallow Water Deeper Water Fig. 8. Delta and Distributaries of Trinity River and hays. Furthermore, so great is the amount of wastebrought down by the streams that the agents above men-tioned fail to distribute the entire burden, in consequenceof which the mouths of the rivers are obstructed by long as river water is in motion it will carry largequantities of mineral matter mechanically suspended, butwhen the motio
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