Nurse logs: An ecological strategy in a late Paleozoic forest from the southern Andean region

The use of recovered paper as a raw material for paper production is by far the most economical and ecological strategy for the disposal of waste paper. However, paper production from recovered paper furnish generates a great amount of residues, and the higher the demand requirements for the end product, the higher the amount of rejected material. The reason for this is that the selectivity of the deinking process is limited; therefore, some valuable components are also lost in reject streams. The rejection of usable components affects the economics of recycled paper production. As the cost of waste disposal continues to increase, this issue is becoming more and more severe. This paper summarizes the current state of the resource efficiency in recycled pulp production and provides information on the volumes of rejected streams and the usable material within them. Various means to use these reject streams are also discussed, including the main findings of a recent thesis by the main author. This review summarizes current internal and external use of reject streams generated in the deinking operations.

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New records of Ephemeroptera from the Colombian Orinoco river basin of the Meta department

Revista Colombiana de Entomología ◽

10.25100/socolen.v43i2.5958 ◽

2017 ◽

Vol 43 (2) ◽

pp. 271

Author(s):

Luis Gonzalo Salinas-Jiménez ◽

José Ismael Rojas-Peña ◽

Diana Paola Osorio-Ramírez ◽

Clara Inés Caro-Caro

Keyword(s):

River Basin ◽

New Records ◽

Andean Region ◽

Orinoco River ◽

First Time

There is extensive research of the Ephemeroptera communities taxonomy and ecology in the Andean region of Colombia. However, other regions such as the Orinoquia have been insufficiently studied. From this region, in the Meta department, four species have been registered: Varipes lasiobrachius Lugo-Ortiz & McCafferty, Coryphorus aquilus Peters, Miroculis (Atroari) colombiensis Savage & Peters and Tricorythopsis rondoniensis (Dias, Cruz & Ferreira). The main objective of this study is to report for the first time for this region the species: Mayobaetis ellenae (Mayo), Hydrosmylodon primanus (Eaton), Haplohyphes baritu Domínguez, Camelobaetidus edmundsi Dominique, Mathuriau & Thomas and Nanomis galera Lugo-Ortiz & McCafferty.

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A bibliographic index of North American late Paleozoic Hyolitha, Amphineura, Scaphopoda, and Gastropoda

10.3133/b1210 ◽

1967 ◽

Keyword(s):

North American ◽

Late Paleozoic

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Zonation of the late Paleozoic Horseshoe Atoll in Scurry and southern Kent Counties, Texas

10.3133/oc53 ◽

1955 ◽

Keyword(s):

Late Paleozoic

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Late Paleozoic foraminifera from southern Chile

Professional Paper ◽

10.3133/pp858 ◽

1976 ◽

Cited By ~ 7

Author(s):

Raymond Charles Douglass ◽

Merlynd Keith Nestell

Keyword(s):

Late Paleozoic ◽

Southern Chile

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Subsurface stratigraphy and basin-fill architecture of the late Paleozoic eastern Taos trough, northern New Mexico, U.S.A.

The Mountain Geologist ◽

10.31582/rmag.mg.57.3.149 ◽

2020 ◽

Vol 57 (3) ◽

pp. 149-176

Author(s):

Nur Uddin Md Khaled Chowdhury ◽

Dustin E. Sweet

Keyword(s):

New Mexico ◽

Sediment Accumulation ◽

Late Paleozoic ◽

North Central ◽

The North ◽

Basement Rocks ◽

Basin Geometry ◽

Deformation Event ◽

Thrust System ◽

Basin Fill

The greater Taos trough located in north-central New Mexico represents one of numerous late Paleozoic basins that formed during the Ancestral Rocky Mountains deformation event. The late Paleozoic stratigraphy and basin geometry of the eastern portion of the greater Taos trough, also called the Rainsville trough, is little known because the strata are all in the subsurface. Numerous wells drilled through the late Paleozoic strata provide a scope for investigating subsurface stratigraphy and basin-fill architecture of the Rainsville trough. Lithologic data obtained predominantly from petrophysical well logs combined with available biostratigraphic data from the greater Taos trough allows construction of a chronostratigraphic framework of the basin fill. Isopach- and structure-maps indicate that the sediment depocenter was just east of the El Oro-Rincon uplift and a westerly thickening wedge-shaped basin-fill geometry existed during the Pennsylvanian. These relationships imply that the thrust system on the east side of the Precambrian-cored El Oro-Rincon uplift was active during the Pennsylvanian and segmented the greater Taos trough into the eastern Rainsville trough and the western Taos trough. During the Permian, sediment depocenter(s) shifted more southerly and easterly and strata onlap Precambrian basement rocks of the Sierra Grande uplift to the east and Cimarron arch to the north of the Rainsville trough. Permian strata appear to demonstrate minimal influence by faults that were active during the Pennsylvanian and sediment accumulation occurred both in the basinal area as well as on previous positive-relief highlands. A general Permian decrease in eustatic sea level and cessation of local-fault-controlled subsidence indicates that regional subsidence must have affected the region in the early Permian.

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