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A new homolid crab, Zygastrocarcinus tricki sp. nov., from the Pierre Shale (middle Campanian), Baculite Mesa, Pueblo County, Colorado, USA

Nyborg T., Bedell M., Garassino A., Larson N. L., Bishop G. A.

Acta Geologica Polonica

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2016

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Vol. 66, no. 4

709--713

EN

A new species of homolid crab, Zygastrocarcinus tricki sp. nov., is reported from the Late Cretaceous (middle Campanian, Baculites scotti Zone) of the Pierre Shale Formation (Baculite Mesa, Pueblo County, Colorado). This nearly complete homolid, hereto described is the sixth species assigned to the genus and extends our knowledge along with the geographical range and geological age of this taxon.

2

Osteology of a large allosauroid theropod from the Upper Jurassic (Tithonian) Morrison Formation of Colorado, USA

Dalman S.

Volumina Jurassica

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2014

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Vol. 12, no. 2

159--180

EN

Two partial skeletons of allosaurid theropods belonging to an adult and a juvenile from the Upper Jurassic (Tithonian) Morrison Formation of McElmo Canyon in Montezuma County, southwestern Colorado, were discovered in 1953 by the late Joseph T. Gregory and David Techter. The adult specimen consists of several isolated cranial and postcranial skeletal elements that are exceptionally well-preserved and include the left premaxilla, maxilla, dentary, teeth, quadratojugal, two caudal vertebrae, pubic peduncle, ischium, proximal tibia, a nearly complete left foot, and several isolated teeth, whereas the juvenile specimen is represented by the distal portion of the right dentary and a fragmentary splenial. The specimens represent a new species of Allosaurus, here named Allosaurus lucasi, which differs from Allosaurus fragilis by having a relatively short premaxilla and robust quadratojugal with short jugal process and a short quadrate process of the quadratojugal that is at the same level as the rostral quadratojugal ramus. The presence of a new species of Allosaurus in the Tithonian of North America provides further evidence of the taxonomic and morphological diversity of the Allosauridae clade and their continuous evolutionary success, which extended to the Cretaceous.

3

Fluvial architecture element analysis of the Brushy Basin Member, Morrison Formation, western Colorado, USA

Galli K.

Volumina Jurassica

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2014

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Vol. 12, no. 2

69--106

EN

The 85-m Brushy Basin Member of the Morrison Formation in western Colorado, USA, comprises dinosaur-bearing sandstones (architectural element CHR and CH), crevasse-splay deposits and minor levee deposits (architectural element CS), mudstones, marlstones, altered ash beds and minor limestones as well as caliche paleosols and noncalcareous paleosols (architectural element FF). Channel sandstones occur at five stratigraphic levels at Trail Through Time (TT), eleven levels at Fruita Paleontological Research Area (FP), and at five levels at Echo Canyon (EC). River-channel sandstones hosted by floodplain mudstones tend to have cut down to resistant caliche paleosols. Depositional facies and architectural element analysis show that the rivers were low gradient, mainly anastomosing, with perennial flow, but seasonal with “flashy” peaks in discharge. Dinosaur bone accumulations are found in some floodplain ponds. Isolated bones are present in anastomosing channel sandstones at TT and in channel sandstone 2 at EC. At FP, major accumulations of bones were rapidly buried in the deep pools at three bends in the meandering river resulting in the formation of channel sandstone 2. There is no evidence for a large lacustrine or playa system at the three localities.

4

Indianie Pueblo – starożytni architekci i rzemieślnicy z Utah i Kolorado

Palonka R

Szkło i Ceramika

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2013

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R. 64, nr 5

18--20

PL

The Mesa Verde region, located in southwestern Colorado and southeastern Utah, is well known to archaeologists and many tourists because of its beautiful landscape and famous cliff dwellings in the alcoves of the sandstone canyons. These ancient villages were constructed an inhabited during the XIII century A.D. by Pueblo culture. This region was one area where ancient Puebloans developed their culture to a great extent. Today, visible traces of it are well preserved architecture in canyons’ alcoves and niches as well as artifacts, and especially black-on-white pottery. Since 2011 study of the settlement model and socio-cultural changes that took place in Pueblo culture as well as documentation of material culture, mainly pottery is realized by Sand Canyon-Castle Rock Community Archaeological Project, first Polish archaeological project in USA, conducted in the Mesa Verde region, southwestern Colorado.

5

Looking for gas in all the tight places

Davis T. L.

Prace Naukowe Instytutu Nafty i Gazu

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2010

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nr 170 wyd. konferencyjne

37--41

EN

Multicomponent seismic data are used to illustrate that sweet spots of high permeability can be identified in a tight gas sand play in western Colorado. These sweet spots coincide with low clay content, high secondary porosity and natural fractures. In addition, the same technology can be used to investigate seal integrity in the petroleum system.

6

The mid-Cenomanian eustatic low

Hancock J.

Acta Geologica Polonica

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2004

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Vol. 54, no. 4

611-627

EN

Through much of the earlier part of the Middle Cenomanian the sea-levels in western Asia, northern Europe and the Western Interior of the U.S.A. were lower than during the later Early Cenomanian and most of the later Middle Cenomanian. In north-west Europe the first sign of this Mid-Cenomanian Eustatic Low was just before the end of the Zone of Cunningtoniceras inerme. There was then an abrupt and strong fall of sea-level at the base of Milankovitch couplet C 1, early in the Subzone of Turrilites costatus. Sea-level continued to be low through couplets C 1 to C 3 for some 60,000 years: this is the Mid-Cenomanian Regressive Trough. In western Germany it has been distinguished as the Primus Event. In north Texas and the Western Interior of the U.S.A. the Trough occurred in the Zone of Conlinoceras tarrantense which can be dated as 95.78 [plus-minus] 0.61 Ma.A later regressive trough occurred at the start of the Subzone of Turrilites acutus, which is marked by the Mid-Cenomanian Event in Germany. The overall lower sea-level from late in the Zone of C. inerme to early in the Subzone of T. acutus is the Mid-Cenomanian Eustatic Low. It lasted some 300,000 years.