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Pluvial Lake Palomas, Northwestern Chihuahua, Mexico Reeves, Corwin C., Jr., 1969, Pp

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Pluvial Lake Palomas, Northwestern Chihuahua, Mexico Reeves, Corwin C., Jr., 1969, Pp New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/20 Pluvial Lake Palomas, northwestern Chihuahua, Mexico Reeves, Corwin C., Jr., 1969, pp. 143-154 in: The Border Region (Chihuahua, Mexico, & USA), Cordoba, D. A.; Wengerd, S. A.; Shomaker, J. W.; [eds.], New Mexico Geological Society 20th Annual Fall Field Conference Guidebook, 228 p. This is one of many related papers that were included in the 1969 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States. No material from the NMGS website, or printed and electronic publications, may be reprinted or redistributed without NMGS permission. Contact us for permission to reprint portions of any of our publications. One printed copy of any materials from the NMGS website or our print and electronic publications may be made for individual use without our permission. Teachers and students may make unlimited copies for educational use. Any other use of these materials requires explicit permission. This page is intentionally left blank to maintain order of facing pages. 143 PLUVIAL LAKE PALOMAS NORTHWESTERN CHIHUAHUA, MEXICO By C. C. REEVES, JR. Department of Geosciences, Texas Technological College, Lubbock ABSTRACT Pluvial Lake Palomas, which once inundated approximately 3,000 square miles of northwestern Chihuahua, Mexico, during post-Kansan time, was confined mainly to Chihuahua by incisement of La Mesa by the Rio Grande. Measured sec- tions and field traverses show the Camp Rice Formation continuous from La Mesa south into Chihuahua, but outcrops of older fluvial and lacustrine units are unknown. Evidence of Lake Palomas such as abandoned beaches, spits, wave-cut escarpments, multiple shorelines and lacustrine deposits, is widespread, the highest well-established Wisconsin level being about ± 4,018 feet. Gravity profiles and regional geology indicate that the eastern part of the Lake Palomas basin is of tectonic origin, the deepest part being north of the Franklin bolson, but south of the International Border. Regional geology also indicates that the possibilities for discovery of commercial continental salines are especially promising in the lacustrine sections. RESUMEN El Lago Pluvial de Palomas, que una vez inundó aproximadamente 3,000 millas cuadradas del noroeste de Chihuahua, Mexico, durante la época post-Kansan, fue restrigido principalmente a Chihuahua de bido a la erosion de La Mesa por el Rio Grande. Secciones medidas y caminamientos muestran que la Forrnación Camp Rice, se continua desde La Mesa hacia el sur a Chihuahua, Pero se desconocen afloramientos de unidades fluviales y lacustres más antiguas. Testigos de la existencia del antiguo Lago de Palomas tales como playas abandonadas, bancos de arena, acantilados cortados por el oleaje, multiples lineas costeras y depósitos lacustres se encuentran ampliamente distribuidos, siendo el más alto de éstos el nivel Wisconsin, bien establecido a una altura de 4,018 pies. Los perfiles gravimetricos y la geologia regional indican que la parte oriental de la cuenca del Lago de Palomas es de origen tectónico, la parte más profunda está al norte del bolson de Franklin e al sur del limite internacional. La geologia re- gional indica también que hay posibilidades de descubrir salinas continentales comerciales, que son especialmente promete- doras en secciones lacustres. INTRODUCTION times. For instance, in northern Mexico, Laguna del Cuervo Pluvial Lake Palomas was named and defined in the 16th northeast of Chihuahua City once covered nearly 600 square Annual New Mexico Geological Society Guidebook miles, and other smaller unnamed basins near Monclova, ( Reeves, 1965). Although the term "Lake Palomas" was Torreon, and Santa Barbara exhibit paleolacustrine features. used by Tamayo (1949) for a small basin along the Chi- EARLY TO MIDDLE PLEISTOCENE huahua-Durango border it is not to be confused with the HISTORY term "pluvial Lake Palomas" which refers to a Pleistocene Early Pleistocene Lake Cabeza de Vaca ( Strain, 1966 ) pluvial lake which once existed in northwestern Chihuahua. once extended throughout the bolsons surrounding El Paso, forming one large lake from the Hueco bolson on the east LOCATION AND DESCRIPTION and north into the Tularosa basin, westward into the The basin of pluvial Lake Palomas, located in the north- Mesilla bolson and south for at least 100 miles into Chi- western part of the Chihuahuan desert (Fig. 1), was named huahua. By late Kansan time filling of the bolsons, the ris- for the village of Palomas on the international border 35 ing mountains, and entrenchment of the Rio Grande in miles south of Deming, New Mexico (Reeves, 1965 ). The the Hueco bolson subdivided the basin of Cabeza de Vaca, Chihuahuan desert, located east of the high Sierra Madre forming isolated impondments. Occidental plateau, extends for about 1,000 miles of Lat. Little is known of the subsurface deposits of Lake Cabeza 20° N., well into New Mexico and Texas. The basin of de Vaca, although deep stratigraphic tests and irrigation pluvial Lake Palomas extends from southeast of Villa Ahu- wells have been drilled in several localities on both sides mada ( 30° 35' N., 106° 31' W.) northwestward to about of the International Border. Pleistocene bolson deposits 32° N., 107° 30' W.; however, there are innumerable other may not necessarily be correlative between Chihuahua and basins in the Chihuahuan desert and on the Sierra Madre south to Mexico City which contained lakes during pluvial NEW MEXICO GEOLOGICAL SOCIETY-TWENTIETH FIELD CONFERENCE 145 Texas and New Mexico, or even between the Hueco and pated in the Hueco bolson after passing through Fillmore Tularosa basins; however, early Pleistocene lacustrine de- pass, for a pirate tributary stream to cut El Paso canyon, posits of Cabeza de Vaca should be distinguishable. entrench the lower Mesilla Bolson, and behead the parent The deep test of the El Paso Water Utilities Board (Sec. Rio Grande west of Fillmore pass if the Rio Grande had not 20, Blk. 80 Tsp. 1), at an elevation of 3,995 feet on the first entrenched itself through the Hueco bolson and Fill- west flank of the Hueco bolson, revealed about ± 3,300 feet more pass. of lacustrine fill, the top of the lacustrine section being Kottlowski (1958), Ruhe (1962: 1964), and Hawley and about 3,000 feet (personal communication, T. L. Cliett). Gile (1966) suggest entrenchment of the Rio Grande from (See Cliett, this guidebook) . The Corps of Engineers integration of the river system to the north; however, the stratigraphic test well east of White Sands (Sec. 15-22S- absence of entrenchment in Fillmore pass and the Hueco 5E ), at an elevation of 3,950 feet, indicates over 5,971 feet trough illustrates that the Rio Grande abandoned the Fill- of bolson fill (written communication, G. C. Doty), much more pass channel before entrenchment took place in either of which appears correlative to the lacustrine section in the bolson. Rather, I suspect that the ancient upstream Rio deep test well near El Paso. Grande flowed mainly into a terminal lake in Chihuahua Lee (1907), Burrows (1910), Bryan (1933), Kottlowski until an increase in discharge caused by glacial runoff and (1958 ), Strain (1965; 1966 ), Reeves (1965), and Hawley pluvial conditions perhaps augmented by integration of up- and Kottlowski (1969) agree that the ancient (Pliocene- stream drainage, raised the lake level to create a higher local middle Pleistocene) Rio Grande northwest of El Paso base level. This caused an increase in deposition and mean- flowed south into Chihuahua through the Mesilla bolson, dering, the situation indicated by the widespread "mixed- terminating in a gigantic lake or lakes. However, there has rounded gravels," which resulted in a distributary spill-over been some disagreement over establishment of the Rio into the Hueco trough, the flow probably dissipating before Grande's present channel through El Paso canyon (Kot- reaching El Paso. Incisement of the Rio Grande on the tlowski, 1958; Strain, 1966) . Mesilla bolson occurred only after destruction of the tem- Strain (1966 ), on the basis of "mixed-rounded gravels" porary base level at El Paso canyon and not by a simple up- containing andesite and Soledad rhyolite in the Hueco stream increase in discharge. trough along the east side of the Franklin Mountains and Breakthrough of the ancient Rio Grande through El Paso logs of wells in Fillmore pass north of El Paso (Knowles canyon and into the Hueco bolson occurred after entrench- and Kennedy, 1956), believes the Rio Grande flowed ment had taken place through the Hueco bolson by the through Fillmore pass and the Hueco bolson. The Mesilla lower Rio Grande, entrenchment which was allowed only and Hueco bolsons aggraded to a common level of about by prior elimination of the temporary base level ( ± 3,900 ± 4,200 feet in the Fillmore pass area, meandering or piracy feet) at the Quitman Mountains.
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