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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] |
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, paleontologic features (facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary rock, sedimentary and volcanic rocks are subdivided the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are Bed, Member, Formation, Group and Supergroup. Formal names of lithostratigraph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mississippian (geology)
The Mississippian ( , also known as Lower Carboniferous or Early Carboniferous) is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous period lasting from roughly 358.9 to 323.2 million years ago. As with most other geochronologic units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years. The Mississippian is so named because rocks with this age are exposed in the Mississippi Valley. The Mississippian was a period of marine transgression in the Northern Hemisphere: the sea level was so high that only the Fennoscandian Shield and the Laurentian Shield were dry land. The cratons were surrounded by extensive delta systems and lagoons, and carbonate sedimentation on the surrounding continental platforms, covered by shallow seas. In North America, where the interval consists primarily of marine limestones, it is treate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bursum Formation
The Bursum Formation is a geologic formation in New Mexico.Bursum Formation at .org It preserves dating back to the . Description The Bursum Formation is primarily |
Buda Limestone
The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas and in southern New Mexico, whose strata date back to the Late Cretaceous. Pterosaur remains are among the fossils that have been recovered from the formation.Barrett, P.M., Butler, R.J., Edwards, N.P., & Milner, A.R. Pterosaur distribution in time and space: an atlas. p61-107. in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer. 2008. Hone, D.W.E., and Buffetaut, E. (eds). Zitteliana B, 28. 264p/ref> Description The Buda Limestone is a dense white to yellow sparry limestone with numerous calcite veins that weathers to yellowish or pinkish due to its iron content. In far western Texas, the formation overlies the Del Rio Formation and is in turn overlain by the Eagle Ford Group. The total thickness is about . In trans-Pecos Texas, the formation rests on the Grayson Formation and is overlain by the Boquillas Formation. In the Big Bend National Park area, the formation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bone Spring Formation
The Bone Spring Formation is a geologic formation found in the Delaware Basin in Texas and New Mexico. It preserves fossils dating back to the Leonardian Age of the Permian Period. Description The formation consists of dark gray deep marine limestone interbedded with shale and sandstone interpreted as turbidites. The total thickness is about . The base of the formation is largely concealed in the subsurface, and the formation is overlain by the Cutoff Shale. The formation grades laterally into the Victorio Peak Formation. The uppermost shale beds of the formation have been assigned to the Avalon Shale. Fossils The formation contains fossils of the brachiopods ''Productus leonardensis'', '' Marginifera cristobalensis'', '' Pugnoides texanus'', ''P. bidentatus'', and '' Composita mexicana''; the ammonites '' Peritrochia erebus'', '' Paracelites elegans'', ''Agathiceras texanum'', and '' Perrinites''. History of investigation The formation was first designated the Bone Springs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bolander Formation
The Gray Mesa Formation is a geologic formation in New Mexico. Its fossil assemblage dates the formation to the Moscovian age of the Pennsylvanian. The formation as presently defined includes outcrops previously assigned to many local units, including the Los Moyos Formation, the Armendaris Group, and the Nakaye Formation. Description The formation consists mostly of cherty limestone, with a few shale, sandstone, and conglomerate beds. It is exposed in the Sandia Mountains, the Lucero Uplift (), the western Jemez Mountains, and the Manzano Mountains. The formation has been mapped as the Los Moyos Formation in the Manzano Mountains, but Spencer G. Lucas and coinvestigators have recommended abandoning the name Los Moyos Formation and using Grey Mesa Formation throughout the Madera Group. The Gray Mesa Formation likely correlates with the Porvenir Formation in the southeastern Sangre de Cristo Mountains. The formation is underlain at most locations by the Sandia Formation, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Canyon Formation
The Bell Canyon Formation is a geologic formation found in the Delaware Basin of southeastern New Mexico and western Texas. It contains fossils characteristic of the Guadalupian Age of the Permian Period. Description The formation consists mostly of marine sandstone and siltstone, but with five interfingering tongues of gray limestone. These extend from the Capitan reef into what was then deep, anoxic water deep of the Permian Basin. Total thickness of the formation is . Fossils The formation's Lamar Limestone Member of Guadalupe Mountains National Park has produced fossil holocephalan teeth. History of investigation The unit was first designated as a formation by DeFord and Lloyd in 1940, who raised the Delaware Mountain Formation to group A group is a number of persons or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bar B Formation
The Bar B Formation is a geologic formation found the Caballo Mountains of New Mexico. It preserves fossils showing it was deposited in the middle to late Pennsylvanian. Description The Bar B formation is mostly cyclic beds of shale and limestone, with shale making up about 80% of the formation and limestone the other 20%. Chert is present in some of the limestone. The upper include reddish-brown siltstone, limestone conglomerate, and calcareous siltstone. The total thickness is about . The formation rests on the Nakaye Formation and is unconformably overlain by the Bursum Formation. The formation likely correlates with the Panther Seep Formation in the San Andres Mountains. Fossils The formation contains abundant bryozoan fossils. History of investigation The formation was first defined by V.C.Kelley and Caswell Silver in 1952. Bachman and Myers criticized its definition in 1975, but it is accepted by Kues and Giles, though they restrict it to the Caballo Mountains. See ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogene
The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (annum, Mya) to the beginning of the Neogene Period Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon. The earlier term Tertiary Period was used to define the span of time now covered by the Paleogene Period and subsequent Neogene Period; despite no longer being recognised as a formal stratigraphy, stratigraphic term, 'Tertiary' is still widely found in earth science literature and remains in informal use. Paleogene is often abbreviated "Pg" (but the United States Geological Survey uses the abbreviation PE for the Paleogene on the Survey's geologic maps). During the Paleogene, evolution of mammals, mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baca Formation
The Baca Formation is a geologic formation in southern New Mexico and Arizona. It preserves fossils dating back to the Eocene period. Description The formation consists of coarse conglomerate, red and white sandstone, and red clay. Its total thickness is , of which is conglomerate. The formation rests unconformably on the Cretaceous Mesaverde Group and is overlain by the Oligocene Spears Formation. The formation was deposited in a basin that developed in Eocene time in eastern Arizona and west-central New Mexico. The basin was mostly a system of braided streams subject to frequent flash floods, with meandering streams restricted to the easternmost part of the basin. Paleocurrent directions showed that stream flow was generally to the east-northeast. Shallow floodplain lakes and a large, shallow closed lake in the eastern part of the basin were also present, though lacustrine beds are nearly absent due to extensive river delta formation. Deposition ended with the eruption ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvanian (geology)
The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, in the International Commission on Stratigraphy, ICS geologic timescale, the younger of two period (geology), subperiods (or upper of two system (stratigraphy), subsystems) of the Carboniferous Period. It lasted from roughly . As with most other geochronology, geochronologic units, the stratum, rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal-productive beds of this age are widespread. The division between Pennsylvanian and Mississippian (geology), Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the Permian. In parts of Europe, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atrasado Formation
The Atrasado Formation is a geologic formation in New Mexico. Its fossil assemblage dates the formation to the Kasimovian age of the Pennsylvanian. It was formerly known locally as the Wild Cow Formation or the Guadelupe Box Formation. Description The formation consists primarily of marine limestone with some sandstone and shale. It is exposed in the Sandia Mountains, the Lucero Uplift (), the western Jemez Mountains, and in the Manzano Mountains. The formation has been mapped as the Wild Cow Formation in the Manzano Mountains and as the Guadelupe Box Formation in the Jemez Mountains. However, Spencer G. Lucas and coinvestigators have recommended abandoning the name Wild Cow Formation and using Atrasado Formation throughout the Madera Group. The formation is likely correlative with the Alamitos Formation in the Sangre de Cristo Mountains. The formation is underlain by the Gray Mesa Formation, with its base defined by a sandstone interval atop an eroded limestone surface of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
