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The lower two diagrams in Figure 6 illustrate a typical isopach map of a small lake delta infill and variations in log response through such a deposit. The isopach tends to indicate a wedge of coarse clastic sediments sandwiched between lower freshwater organic lacustrine deposits and overlying swamp and marsh deposits. Most often the logs will document the coarsening-upward sequence of this delta fill. Within the sand body, dip angles are often quite high, reaching 10 to 15°, and result primarily from the foresets of the rapidly prograding lacustrine delta. Often, resistivity kicks are extremely common within such a setting and are responses to lignite, coal, and iron-rich seams which form within these essentially red bed deposits. The sand body itself normally displays a graded base; however, in some areas, generally near breaks in the riverbank, thick, sharp-based sands can often accumulate immediately within the region of the actual crevassing.
The lower two diagrams in Figure 6 illustrate a typical isopach map of a small lake delta infill and variations in log response through such a deposit. The isopach tends to indicate a wedge of coarse clastic sediments sandwiched between lower freshwater organic lacustrine deposits and overlying swamp and marsh deposits. Most often the logs will document the coarsening-upward sequence of this delta fill. Within the sand body, dip angles are often quite high, reaching 10 to 15°, and result primarily from the foresets of the rapidly prograding lacustrine delta. Often, resistivity kicks are extremely common within such a setting and are responses to lignite, coal, and iron-rich seams which form within these essentially red bed deposits. The sand body itself normally displays a graded base; however, in some areas, generally near breaks in the riverbank, thick, sharp-based sands can often accumulate immediately within the region of the actual crevassing.
==Further reading==
''Literature on braided-channel deposits.''<ref name=Clapp_1922>Clapp, F. G., 1922, The Hwang Ho, Yellow River: Geogr. Review, v. 12, p. 1-18.</ref> <ref name=Leopoldandwolman_1957>Leopold, L. B., and M. G. Wolman, 1957, River channel patterns: braided, meandering, and straight: U.S. Geol. Survey Prof. Paper 282-B, p. 39-85.</ref> <ref name=NEDECO_1959>NEDECO, 1959, River studies and recommendations on improvement of Niger and Benue: Amsterdam, North Holland Pub. Co., 1000 p.</ref> <ref name=Wright_1959>Wright, M. D., 1959, The formation of cross-bedding by a meandering or braided stream: Jour. Sed. Petrology, v. 29, p. 610-615.</ref> <ref name=Chien_1961>Chien, N., 1961, The braided stream of the lower Yellow River: Sci. Sinica, Peking, v. 10, p. 734-754.</ref> <ref name=Doeglas_1962>Doeglas, D. J., 1962, The structure of sedimentary deposits of braided rivers: Sedimentology, v. 1, p. 167-190.</ref> <ref name=Krigstrom_1962>Krigstrom, A., 1962, Geomorphological studies of sandur plains and their braided rivers in Iceland: Geog. Ann., no. 44, p. 328-346.</ref> <ref name=Are_1963>Are, H. T., 1963, The braided stream depositional environment: PhD dissertation, Univ. Wyoming, 205 p.</ref> <ref name=Fahnestock_1963>Fahnestock, R. K., 1963, Morphology and hydrology of a braided stream: U.S. Geol. Survey Prof. Paper 422A, p. 1-70.</ref> <ref name=Allen_1965a>Allen, J. R. L., 1965, Fining upward cycles in alluvial succession: Liverpool, Manchester, Geol. Jour., v. 4, p. 229-246.</ref> <ref name=Allen_1965b>Allen, J. R. L., 1965b, A review of the origin and characteristics of Recent alluvial sediments: Sedimentology, v. 5, p. 88-191.</ref> <ref name=Visher_1965>Visher, G. S., 1965, Fluvial processes interpreted from ancient and recent fluvial deposits: in G. V. Middleton, ed., Primary sedimentary structures and their hydrodynamic interpretation: SEPM Spec. Pub. no. 12, p. 133-148.</ref> <ref name=Visher_1972>Visher, G. S., 1972, Physical characteristics of fluvial deposits: in J. K. Rigby and W. K. Hamblin, eds., Recognition of ancient sedimentary environments: SEPM Spec. Pub. 16, p. 84-97.</ref> <ref name=Coleman_1969>Coleman, J. M., 1969, Brahmaputra River: channel processes and sedimentation: Sedimentary Geology, v. 3, p. 129-239.</ref> <ref name=Williamsandrust_1969>Williams, P. F., and B. R. Rust, 1969, The sedimentology of a braided river: Jour. Sed., Petrology, v. 39, p. 649-679.</ref> <ref name=Collinson_1970>Collinson, J. D. 1970, Bedforms in the Tana River, Norway: Geog. Ann., Stockholm, v. 52, p. 31-56.</ref> <ref name=Smith_1970>Smith, N. D., 1970, The braided stream depositional environment: Comparison of the Platte River with some Silurian clastic rocks, north-central Appalachians: Geol. Soc. America Bull., v. 81, p. 2993-3014.</ref> <ref name=Rust_1972>Rust, B. R., 1972, Structure and process in a braided river: Sedimentology, v. 18, p. 221-245.</ref> <ref name=Schumm_1972>Schumm, S. A., 1972, River morphology: Dowden, Hutchinson and Ross, Stroudsburg, Pa., 448 p.</ref> <ref name=Fahnestockandbradley_1973>Fahnestock, R. K., and W. C. Bradley, 1973, Knik and Matanuska Rivers, Alaska: a contrast in braiding: in M. Morisawa, ed., Fluvial geomorphology: Publications in Geomorphology, State Univ. of New York, Binghampton, 314 p.</ref> <ref name=Sheltonandnoble_1974>Shelton, J. W., and R. L. Noble, 1974, Depositional features of braided-meandering stream: AAPG Bull., v. 58, no. 4, p. 742-752.</ref> <ref name=Cantandwalker_1976>Cant, D. J., and W. G. Walker, 1976, Development of a braided-fluvial facies model for the Devonian Battery Point Sandstone: Can. Jour. Earth Sci., v. 13, p. 102-119.</ref>
''Literature on meandering rivers and their characteristics.'' <ref name=Fisk_1944>Fisk, H. N., 1944, Geological investigation of the alluvial valley of the lower Mississippi River: U.S. Army Corps of Engr., Mississippi River Commission, Vicksburg, Miss.</ref> <ref name=Sundborg_1956>Sundborg, A., 1956, The River Klaralven: a study of fluvial processes: Geog. Ann., v. 38, p. 125-136.</ref> <ref name=Leopoldandwolman_1957 /> <ref name=Frazierandosanik_1961>Frazier, D. E., and A. Osanik, 1961, Point-bar deposits, Old River Locksite, Louisiana: Trans. Gulf Coast Assoc. Geol. Soc., v. 11, p. 121-137.</ref> <ref name=Harmsetal_1963>Harms, J. C., D. B. MacKenzie, and D. G. McCubbin, 1963, Stratification in modern sands of the Red River, Louisiana: Jour. Geology, v. 71, p. 556-580.</ref> <ref name=Allen_1965a /> <ref name=Steinmetz_1967>Steinmetz, R., 1967, Depositional history, primary sedimentary structures, cross bed dips, and grain size of an Arkansas River point bar at Wekiwa, Oklahoma: Rept. F67-G-3, Amoco Production Co.</ref> <ref name=Bernardetal_1970>Bernard, H. A., et al, 1970, Brazos alluvial plain environment: Texas Bureau of Econ. Geol. Guidebook No. 11.</ref> <ref name=McGowenandgarner_1970>McGowen, J. H., and L. E. Garner, 1970, Physiographic features and stratification types of coarse-grained point bars: modern and ancient examples: Sedimentology, v. 14, p. 77-111.</ref> <ref name=Bluck_1971>Bluck, B. J., 1971, Sedimentation in the meandering river Endrick: Scot. Jour. Geol., v. 7, p. 93-138.</ref> <ref name=Fisherandbrown_1972>Fisher, W. L., and L. F. Brown, 1972, Clastic depositional systems--a genetic approach to facies analysis: Bur. of Econ. Geol., Univ. of Texas at Austin, 211 p.</ref> <ref name=Jackson_1975>Jackson, R. G., 1975, A depositional model of point bars in the lower Wabash River meander belt: PhD thesis, Illinois Univ., Urbana, 269 p.</ref> <ref name=Lewin_1976>Lewin, J., 1976, Initiation of bedforms and meanders in coarse-grained sediment: Geol. Soc. America Bull., v. 87, p. 281-285.</ref>
''Literature on lacustrine deposits.'' <ref name=Twenhofel_1950>Twenhofel, W. H., 1950, Principles of sedimentation: New York, McGraw-Hill, 673 p.</ref> <ref name=Fisk_1952>Fisk, H. N., 1952, Geological investigation of the Atchafalaya Basin and problems of Mississippi River diversion: U.S. Army Corps of Engineers, Mississippi River Commission, Vicksburg, Miss., p. 1-145.</ref> <ref name=Bradley_1964>Bradley, W. H., 1964, Geology of Green River Formation and associated Eocene rocks in southwestern Wyoming and adjacent parts of Colorado and Utah: U. S. Geol. Survey Prof. Paper 496A, 86 p.</ref> <ref name=Vanhouton_1964>van Houton, F. B., 1964, Cyclic lacustrine sedimentation, Upper Triassic Lockatong Formation: in D. F. Merriam, ed., Symposium on cyclic sedimentation: Kansas Geol. Bull. 169, p. 497-531.</ref> <ref name=Colemanandgagliano_1965>Coleman, J. M., and S. M. Gagliano, 1964, Cyclic sedimentation in the Mississippi River deltaic plain: Gulf Coast Assoc. Geol. Socs. Trans., v. 14, p. 67-80.</ref> <ref name=Coleman_1966>Coleman, J. M., 1966, Ecological changes in a massive freshwater clay sequence: Gulf Coast Assoc. Geol. Soc. Trans., v. 16, p. 159-174.</ref> <ref name=Axelson_1967>Axelson, V., 1967, The Laitaure Delta, a study of deltaic morphology and processes: Geog. Ann., Stockholm, v. 49, p. 1-127.</ref> <ref name=Colemanandho_1968>Coleman, J. M., and C. L. Ho, 1968, Early diagenesis and compaction in clays: Proc. Symp. on Abnormal Subsurface Pressures, Louisiana State Univ., Baton Rouge, p. 23-50.</ref> <ref name=Reeves_1968>Reeves, C. C., Jr., 1968, Introduction to paleolimnology: in Developments in sedimentology, v. II: Amsterdam, Elsevier, 228 p.</ref> <ref name=Muller_1971>Muller, G., 1971, Sediments of Lake Constance: Guidebook, 8th Inter. Sedimentology Cong., p. 237-252.</ref>
==See also==
==See also==