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Todilto Formation
The Todilto Formation is a geologic formation in northern New Mexico and southeastern Colorado. It preserves fossils dating back to the Callovian stage of the middle Jurassic period. Description The formation consists of evaporites. It is divided into a lower calcareous shale (the Luciano Mesa Member) up to thick, and an upper gypsum bed (the Tonque Arroyo Member). Based on varve counts in the Luciano Mesa Member, the formation was laid down in a geologically brief period of time, likely in a salina (a coastal body of saline water) that was replenished both by rivers and by seepage or periodic flooding from the Sundance Sea. The varves show a 10 to 13 year periodicity that is interpreted as the solar sunspot cycle, showing that this cycle has existed for at least 160 million years. The contact with the underlying Entrada Formation is very sharp and may indicate the Todilto Sea formed catastrophically from a breach in a barrier between the basin and the Sundance Sea. The pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleontology In New Mexico
Paleontology in New Mexico refers to paleontological research occurring within or conducted by people from the U.S. state of New Mexico. The fossil record of New Mexico is exceptionally complete and spans almost the entire stratigraphic column. More than 3,300 different kinds of fossil organisms have been found in the state. Of these more than 700 of these were new to science and more than 100 of those were type species for new genera. During the early Paleozoic, southern and western New Mexico were submerged by a warm shallow sea that would come to be home to creatures including brachiopods, bryozoans, cartilaginous fishes, corals, graptolites, nautiloids, placoderms, and trilobites. During the Ordovician the state was home to algal reefs up to 300 feet high. During the Carboniferous, a richly vegetated island chain emerged from the local sea. Coral reefs formed in the state's seas while terrestrial regions of the state dried and were home to sand dunes. Local wildlife includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In New Mexico
This article contains a list of fossil-bearing stratigraphic units in the state of New Mexico, U.S. Sites See also * Paleontology in New Mexico References * {{DEFAULTSORT:Fossiliferous stratigraphic units in New Mexico New Mexico Stratigraphic units A stratigraphic unit is a volume of Rock (geology), rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrology, petrographic, lithology, lithologic or paleontology, p ... Stratigraphy of New Mexico New Mexico geography-related lists United States geology-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Ysidro, New Mexico
San Ysidro is a village in Sandoval County, New Mexico, United States. The population was 193 at the 2010 census. It is part of the Albuquerque Metropolitan Statistical Area. Description The village is near the junction of U.S. Highway 550 and NM Highway 4, at the south end of the Jemez Valley. The Jemez River runs through San Ysidro, just north of where the Rio Salado River joins the Jemez River. The village has been a farming community since 1699 when Juan Trujillo established a settlement named for San Ysidro, or Saint Isidore the Farmer. The Village was incorporated in 1967. An annual San Ysidro Fiesta Day is held each year in mid-May. In 2007, the exterior sets for the Taylor Hackford film '' Love Ranch'' were built just outside of San Ysidro on Highway 550. Geography San Ysidro is located at (35.553457, -106.770566). According to the United States Census Bureau, the village has a total area of , all land. Demographics As of the census of 2000, there were 23 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Felipe Pueblo, New Mexico
San Felipe Pueblo ( Eastern Keres: Katishtya, Navajo ''Tsédááʼkin'') is a census-designated place (CDP) in Sandoval County, New Mexico, United States, and is located 10 miles (16 km) north of Bernalillo. As of the 2000 census, the CDP population was 2,080. It is part of the Albuquerque Metropolitan Statistical Area. Description The Pueblo, founded in 1706, is home to a Native American Nation who speak an eastern dialect of the Keresan languages. The Pueblo celebrates the annual Feast of St. Philip on May 1, when hundreds of pueblo people participate in traditional corn dances. Today, the tribe operates Black Mesa Casino formerly San Felipe Casino and Casino Hollywood, just off Interstate 25. Geography San Felipe Pueblo is located at (35.426985, -106.443593). According to the United States Census Bureau, the CDP has a total area of 12.2 square miles (31.6 km), of which 11.9 square miles (30.8 km) is land and 0.3 square mile (0.8 km) (2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Bajada, New Mexico
La Bajada is a census-designated place in Santa Fe County, New Mexico, United States. It is named after a geographical feature of the nearby Caja del Rio. History A post office called La Bajada was established in 1870, closed in 1872. La Bajada is derived from Spanish meaning "the descent". Education It is within Santa Fe Public Schools Santa Fe Public Schools (SFPS) is a school district based in Santa Fe, New Mexico. Santa Fe Public Schools serves the city of Santa Fe, the communities of Tesuque and Eldorado, and the historic neighborhood of Agua Fria, and other communities .... See also References External links Census-designated places in Santa Fe County, New Mexico Census-designated places in New Mexico {{NewMexico-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albuquerque Basin
The Albuquerque Basin (or Middle Rio Grande Basin) is a structural basin and ecoregion within the Rio Grande rift in central New Mexico. It contains the city of Albuquerque. Geologically, the Albuquerque Basin is a half-graben that slopes down towards the east to terminate on the Sandia and Manzano mountains. The basin is the largest and oldest of the three major basins in the Rio Grande rift, containing sediments whose depth ranges from . The basin has a semi-arid climate, with large areas that count as desert. Paleo-Indian traces dating back 12,000 years show that the climate used to be wetter and more fertile than it is today. The Rio Grande flows through the basin from north to south, and its valley has been irrigated for at least 1,000 years. Intense irrigation began in the late nineteenth century with new dams, levees and ditches and has caused environmental problems. In times of low water levels in the Rio Grande, Albuquerque relies on groundwater for its potable wat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stromatolite
Stromatolites () or stromatoliths () are layered sedimentary formations (microbialite) that are created mainly by photosynthetic microorganisms such as cyanobacteria, sulfate-reducing bacteria, and Pseudomonadota (formerly proteobacteria). These microorganisms produce adhesive compounds that cement sand and other rocky materials to form mineral "microbial mats". In turn, these mats build up layer by layer, growing gradually over time. A stromatolite may grow to a meter or more. Although they are rare today, fossilized stromatolites provide records of ancient life on Earth. Morphology Stromatolites are layered, biochemical, accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms (specifically microbial mats), through the action of certain microbial lifeforms, especially cyanobacteria. They exhibit a variety of forms and structures, or morphologies, including conical, stratiform, domal, columnar, and branching ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dasycladales
Dasycladales is an order of large unicellular green algae in the class Ulvophyceae. It contains two families, the Dasycladaceae and the Polyphysaceae. These single celled algae are from 2 mm to 200 mm long. They live on substrates in shallow warm (>20°C) euhaline tropical marine waters, usually less than 20 meters deep, and protected from waves. They are very large cells. They are able to attain these sizes without numerous internal cell wells because they build calcium carbonate shells around themselves. They contain only one nucleus in their vegetative stage, which remains in the bottom of the cell in the holdfast at the substrate. Only when they are ready to produce gametes does the nucleus undergo meiosis and then numerous mitoses into many nuclei which then migrate into the gametangia at the top of the alga. Because the nucleus is safely hidden in the holdfast, the cells easily regenerate if the top portions are broken off. These algae are notable for hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Cycle
The solar cycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a nearly periodic 11-year change in the Sun's activity measured in terms of variations in the number of observed sunspots on the Sun's surface. Over the period of a solar cycle, levels of solar radiation and ejection of solar material, the number and size of sunspots, solar flares, and coronal loops all exhibit a synchronized fluctuation from a period of minimum activity to a period of a maximum activity back to a period of minimum activity. The magnetic field of the Sun flips during each solar cycle, with the flip occurring when the solar cycle is near its maximum. After two solar cycles, the Sun's magnetic field returns to its original state, completing what is known as a Hale cycle. This cycle has been observed for centuries by changes in the Sun's appearance and by terrestrial phenomena such as aurora but was not clearly identified until 1843. Solar activity, driven by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sundance Sea
The Sundance Sea was an epeiric sea that existed in North America during the mid-to-late Jurassic Period of the Mesozoic Era. It was an arm of what is now the Arctic Ocean, and extended through what is now western Canada into the central western United States. The sea receded when highlands to the west began to rise. Stratigraphy The Sundance Sea did not occur at a single time; geological evidence suggests that the Sea was actually a series of five successive marine transgressions—each separated by an erosional hiatus—which advanced and receded from the middle Jurassic onward. The terrestrial sediments of the Morrison Formation—eroded from rising highlands to the west—were deposited on top of the marine Sundance sediments as the sea regressed for the last time late in the Jurassic. Fauna The Sundance Sea was rich in many types of animals. ''Gryphaea'' was extremely common, and shark teeth have been found. In addition to fish, belemnites and to an extent ammonites ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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