Gulf Coastal Plain


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Gulf Coastal Plain

 

a lowland in the United States and Mexico that borders the Gulf of Mexico.

The Gulf Coastal Plain, which merges with the Atlantic Lowland in the northeast, has widths to 350 km. Composed of a layer of marine sedimentary rocks measuring up to 6,000–10,000 m thick, the plain contains large deposits of oil and fuel gas (seeGULF OF MEXICO OIL AND GAS BASIN). There are elevations to 150 m, with the surface rising gradually from south to north and forming several parallel cuestas. The Gulf Coastal Plain is intersected by the valleys of several large rivers, including the Mississippi, Alabama, Brazos, and Rio Grande (Río Bravo del Norte). The shore is dotted with lagoons and numerous estuaries. Except in the tropical southwest the climate is subtropical. The average January temperature is 4°–8°C in the north and as high as 12° C on the coast; the average July temperature is 26°–28°C. Annual precipitation reaches 600–800 mm in the west and 1,200–1,500 mm in the east.

Red soils and highly fertile soddy-calcareous (on limestones) and soddy-alluvial (in river floodlands) soils are prevalent. Marsh soils are also widespread. More than a third of the territory is wooded. There are pine woods with dwarf palmettos in the underbrush and mixed forests of pine with evergreen oaks, magnolias, and myrtles. Along the rivers there are water tupelo (Nyssa aquatica), bald cypress, and poplar forests, and in the west there is savanna. Most of the plain is planted with cotton, but along the coast there are tobacco, sugarcane, and rice plantings. Subtropical fruits are also grown. The large port cities are New Orleans, Houston, Corpus Christi, Tampico, and Veracruz.

G. M. IGNAT’EV

References in periodicals archive ?
Then she presents road trip guides in the state's three Grand Divisions: the Appalachian Highlands of East Tennessee, the Interior Low Plateaus of Middle Tennessee, and the Gulf Coastal Plain of West Tennessee.
We chose these two parishes because they have good species lists (Hardy, 1979, 1982; Hardy and LeGrande, 1979; Wiedenfeld and Swan, 2000) and because, like the Big Thicket, they are in the West Gulf Coastal Plain. Bossier and Caddo parishes are located 150 km northeast of the Big Thicket in northwestern Louisiana on the Texas and Arkansas border and consist of 4457 [km.sup.2], or an area between one-fourth and one-third the size of the Big Thicket.
Once scattered along the Gulf coastal plain from southern Louisiana east into Mississippi and Alabama, the stately four-foot- (1.2 m-) tall birds almost became extinct after fire suppression changed their habitat.
Bantam sunfish were collected from all major drainages within the Gulf Coastal Plain and Mississippi Alluvial Plain physiographic provinces of Arkansas, including the Arkansas, Ouachita, Mississippi, Red, Saline, St.
Blackland Prairies of the Gulf Coastal Plain: Nature, Culture, and Sustainability.
The region includes the Gulf Coastal Plain and the Lower Mississippi River Valley.
of trees Diameter at breast height Region sampled Mean Range (cm) South Atlantic Coastal Plain 33 24.4 18.0 to 33.5 North Atlantic Coastal Plain 28 25.9 20.6 to 36.6 Upper Coastal Plain 14 25.9 20.6 to 33.0 Piedmont 29 25.9 20.8 to 32.0 Gulf Coastal Plain 9 22.6 19.1 to 29.0 Hilly Coastal Plain 27 24.4 19.3 to 30.2 All regions combined 140 25.1 18.0 to 36.6 Total height Age Region Mean Range Mean Range (m) (yr) South Atlantic Coastal Plain 20.7 15.8 to 25.3 23 21 to 25 North Atlantic Coastal Plain 21.0 18.0 to 24.7 22 20 to 25 Upper Coastal Plain 20.7 16.2 to 27.1 23 20 to 26 Piedmont 18.9 15.9 to 23.2 23 20 to 26 Gulf Coastal Plain 20.4 16.5 to 22.6 21 18 to 22 Hilly Coastal Plain 19.5 14.3 to 23.2 22 20 to 25 All regions combined 20.1 14.3 to 27.1 22 18 to 26 Table 2.
The Atlantic and Gulf Coastal Plain of the United States, generally referred to as the southeastern Coastal Plain, is a broad region including physiographic areas, which are quite varied in geohydrologic conditions (Figure 1).
The park's 96 acres straddle two distinct ecological zones, the Gulf Coastal Plain and the Edwards Plateau.
The above vertebra is assigned to Texasophis fossilis, previously reported only from the middle Miocene (Barstovian) of the Gulf Coastal Plain of Texas (Holman 1977).

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