Pleistocene grebes from the Old Crow Basin, Yukon Territory

1978 ◽  
Vol 15 (12) ◽  
pp. 1887-1892 ◽  
Author(s):  
Gerald R. Fitzgerald
Keyword(s):  
Late Pleistocene ◽  
Yukon Territory ◽  
Minimum Age ◽  
Podiceps Grisegena

Four grebe fossils of presumed late Pleistocene age are reported from the Old Crow Basin. They include one Red-necked Grebe (Podiceps grisegena), two Horned Grebes (Podiceps auritus) and an unidentified grebe (Podiceps sp.). Three of the specimens have a minimum age of approximately 10 700 years BP.

Paleoecological implications of Late Pleistocene and Holocene microtine rodents from the Bluefish Caves, northern Yukon Territory

1989 ◽  
Vol 26 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Richard E. Morlan
Keyword(s):  
Late Pleistocene ◽  
Growing Season ◽  
Microtus Pennsylvanicus ◽  
Yukon Territory ◽  
Meadow Vole ◽  
Tooth Size ◽  
Microtine Rodents ◽  
Clethrionomys Rutilus ◽  
Tundra Vole ◽  
Dicrostonyx Torquatus

Bluefish Caves 1, 2, and 3 have produced tens of thousands of vertebrate remains among which at least nine species of microtine rodents are represented: red-backed vole, Clethrionomys rutilus; collared lemming, Dicrostonyx torquatus; brown lemming, Lemmus sibiricus; singing vole, Microtus miurus; tundra vole, Microtus oeconomus; meadow vole, Microtus pennsylvanicus; yellow-cheeked or taiga vole, Microtus xanthognathus; muskrat, Ondatra zibethicus; and northern bog lemming, Synaptomys borealis. Late Pleistocene and Holocene components are clearly distinguishable from one another in each of the three caves, and each component can be subdivided within cave 1. This paper discusses (i) variations in taxonomic abundance through time and between site areas, (ii) contrasts in microhabitat between north-facing cave 1 and south-facing cave 2, and (iii) decreases in tooth size that may reflect a reduction in the length of the growing season. A general decrease in diversity is shown to involve increased dominance and decreased species richness and evenness. These changes are attributed to postglacial zonation of habitat.

Pleistocene peccary, Platygonus compressus Le Conte, from Yukon Territory, Canada

1980 ◽  
Vol 17 (9) ◽  
pp. 1204-1209 ◽  
Author(s):  
B. F. Beebe
Keyword(s):  
United States ◽  
Cold Tolerance ◽  
Late Pleistocene ◽  
Yukon Territory ◽  
The Arctic ◽  
Northeastern United States ◽  
Northern Limit ◽  
Arctic Circle

A fragmented radius of a late Pleistocene peccary, Platygonus compressus Le Conte, has been recovered near Old Crow, Yukon Territory, Canada. The known northern limit of the species is thus extended approximately 3000 km, from the northeastern United States to north of the Arctic Circle in Pleistocene Beringia, and confirms the cold tolerance of the species. The small size of the specimen supports a theory that small size in P. compressus is correlated with periglacial environment. Although the age of the specimen is uncertain, a mid-Wisconsin age is inferred on the basis of availability of a route of dispersal to Beringia and palaeoecological evidence which suggest a largely treeless tundra dominated by sedges and grasses, but with a rich herb component.

scholarly journals Tenggar Cave, Tulungagung: preliminary study and its paleontological potentials

2021 ◽  
Vol 47 (3) ◽  
pp. 29-30
Author(s):  
Agus Tri Hascaryo ◽  
Rusyad Adi Suriyanto ◽  
Delta Bayu Murti ◽  
Tuti Koesbardiati
Keyword(s):  
Late Pleistocene ◽  
Faunal Remains ◽  
East Side ◽  
Front Width ◽  
Point Of Interest ◽  
Large Trees ◽  
Minimum Age ◽  
Absolute Dating ◽  
Preliminary Study ◽  
Western Side

Goa Tenggar or Tenggar Cave is situated in the karstic physiography of southern Tulungagung, East Java that made up of prehistoric caves. These include the Wajak complex (minimum age of 37.4 to 28.5 thousand years ago) and the Song Gentong (around 7000 BP). The formation of Tenggar Cave is influenced by the subterranean river that penetrates the limestone unit. This cave has a front width of ± 10 m and a roof height of ± 8 m. The east side of the cave floor is a layer of soil, and the western side is the river. The inside of the cave composed by very compact conglomerate deposits and paleosoil that contains faunal remains, including Cervus sp., Bos sp., Bubalus sp., and Bibos sp., which may have occurred during the Pleistocene. The fossilized faunal remains from Tenggar Cave show that there was a relatively open environment during that time, such as a savannah with large trees and flowing rivers around the cave. The paleoenvironment indicates late Pleistocene to early Holocene period, similar to paleoenvironment in the Sewu Mountains that stretch along the southern part Java from central to the eastern tip of the island includes the coastal towns of Gunung Kidul, Pacitan and Tulungagung. The situation is certainly a point of interest when associating the findings with the surrounding sites, starting from Wajak, Song Gentong, Pacitan, Ponorogo, and Gunung Kidul. However, absolute dating test is necessary to be more certain of the lifetime of the fossilized fauna. If the fossils were from the Late Pleistocene, it could be an important information for the fields of paleontology, paleoanthropology, and prehistoric archaeology given that the occurrence of sites with such antiquity are limited in Southeast Asia. It is essential to conduct intensive research in Tenggar Cave in the future.

Acheulian and Tephra from Upland Western Maharashtra, (Deccan Volcanic Province), Peninsular India

2021 ◽  
pp. SP515-2020-208
Author(s):  
Sushama G. Deo ◽  
Andre Baptista ◽  
Sharad N. Rajaguru
Keyword(s):  
Late Pleistocene ◽  
High Energy ◽  
Early Pleistocene ◽  
Deccan Volcanic Province ◽  
Peninsular India ◽  
Volcanic Province ◽  
Dating Methods ◽  
Tephra Deposit ◽  
Minimum Age ◽  
Technological Analysis

AbstractThe two Early Acheulian sites of Bori and Morgaon from the Deccan Volcanic Province in Upland Maharashtra, India bear some association with an acidic tephra deposit in a fluvial context. Acheulian artefacts in association with tephra were first reported in India from the site of Bori and numerous efforts to date this tephra have since been undertaken. These efforts employed various dating methods and produced a total of 10 absolute dates ranging from the Early Pleistocene with a maximum age of 1.4 ma to the Late Pleistocene with a minimum age of 23.4 ± 2.4 ka. However, field observations and a typo-technological analysis strongly suggests that these Early Acheulian artefacts occur in a semi-primary context and thus contest the Late Pleistocene age of the tephra and re-deposition of the artefacts as argued by some scholars.At Morgaon, the Acheulian artefacts have been recovered from basal fluvial sediments that contain clasts of laterite. These sediments are capped by two low energy clay facies that are separated by a high energy gravel lense. The tephra at Morgaon has been reported from the upper clay facies and has produced absolute dates ranging from the Matuyama period (> 0.78 ma) to the Late Pleistocene (41 ka).After more than two decades of investigation at these sites, the number of absolute dates procured through methods such as ESR, 39Ar-40Ar, U-Th and Palaeo-magnetism though encouraging, are inconclusive. The present communication is therefore an attempt to gauge the nature of palaeo-landscapes that most probably existed during the Early Quaternary. This will be achieved by studying local geomorphological variability between the two sites along with a preliminary analysis of lithic morphology.

New Spruce (Picea spp.) Macrofossils from Yukon Territory: Implications for Late Pleistocene Refugia in Eastern Beringia

ARCTIC ◽  
2009 ◽  
Vol 59 (4) ◽  
Author(s):  
G.D. Zazula ◽  
A.M. Telka ◽  
C.R. Harington ◽  
C.E. Schweger ◽  
R.W. Mathewes
Keyword(s):  
Late Pleistocene ◽  
Yukon Territory ◽  
Pleistocene Refugia

scholarly journals Dental Characteristics of Late Pleistocene Equus Lambei from the Bluefish Caves, Yukon Territory, and their Comparison with Eurasian Horses

2007 ◽  
Vol 50 (1) ◽  
pp. 81-93 ◽  
Author(s):  
Ariane Burke ◽  
Jacques Cinq-Mars
Keyword(s):  
Late Pleistocene ◽  
Yukon Territory ◽  
Size Reduction ◽  
Human Occupation ◽  
Large Sample

ABSTRACT Bluefish Caves I, II and III of northern Yukon, have yielded the earliest in situ evidence of human occupation of Eastern Beringia, associated with one of the largest and most diverse Late Pleistocene faunas recovered in the region. This paper presents data derived from the study of a large sample of horse teeth recovered from the three caves. This research contributes to our knowledge of the Late Pleistocene Beringian equid, Equus lambei. A comparison of the dentition of E. lambei with that of some contemporary European horses, indicates they have similar size cheekteeth. The hypothesis of a Late Pleistocene trend of size reduction in equids is considered in the light of this comparison.

Late-glacial fluctuations of two southern Patagonia outlet glaciers revealed by high-resolution seismic surveys

2020 ◽  
Vol 97 ◽  
pp. 111-124 ◽  
Author(s):  
Emanuele Lodolo ◽  
Jorge Lozano ◽  
Federica Donda ◽  
Donald Bran ◽  
Luca Baradello ◽  
...  
Keyword(s):  
High Resolution ◽  
Late Pleistocene ◽  
Late Glacial ◽  
Seismic Profiles ◽  
Seismic Surveys ◽  
Southern Patagonia ◽  
Minimum Age ◽  
General Phase ◽  
Lake Floor ◽  
Bathymetric Map

AbstractLago Argentino hosts various calving glaciers, among them the famous Perito Moreno. Whereas the onland late Pleistocene–Holocene glacial history is rather well constrained, the submerged glacier-related features were until now undisclosed. Here we present a series of high-resolution seismic profiles revealing moraine bodies associated with the late-glacial glacier dynamics and the first bathymetric map of the Brazo Rico and Brazo Sur, the two southern arms of Lago Argentino. At the eastern termination of Brazo Rico, we identified at the lake floor the submerged expression of the Puerto Bandera 3 moraine mapped onshore, which represents the oldest event (12,660 ± 70 cal yr BP oldest minimum age) recognized in this lake arm, and seven other younger events expressed by a series of terminal and recessional moraines. Along the Brazo Sur, few moraine bodies have been imaged by seismic data. Here, the youngest temporal constraint comes from the Frías moraine (ca. 6000 cal yr BP), which closes off the southern end of the Brazo Sur. At the confluence of the two arms, the Perito Moreno and the former Frías glacier merged and flowed toward east during their late-glacial maximum advance (i.e., Puerto Bandera 1 moraine). The subaqueous evidence of moraine bodies testifies to the occurrence of previously undocumented pulses of the Perito Moreno and former Frías glaciers within the general phase of late Pleistocene–Holocene regression.

The brown lemming, Lemmus sibiricus (Rodentia, Arvicolidae), in the late Pleistocene of Alberta and its postglacial dispersal

1980 ◽  
Vol 58 (8) ◽  
pp. 1507-1511 ◽  
Author(s):  
James A. Burns
Keyword(s):  
British Columbia ◽  
Late Pleistocene ◽  
Small Mammal ◽  
Rocky Mountains ◽  
Yukon Territory ◽  
Rock Shelter ◽  
Fossil Remains ◽  
Relict Population

The first fossil remains of Lemmus sibiricus south of Beringia are reported from a rock shelter called January Cave in the Front Ranges of the Rocky Mountains, southwestern Alberta, Canada. The 45 specimens were excavated along with several thousands of isolated small mammal teeth and fragmentary bones. Dated by both radiocarbon and thermoluminescence methods to span the last 22 000 – 23 000 years, a late Pleistocene-through-present sequence is provided. Argument is made for the existence of a southern relict population of this lemming prior to a northward, postglacial dispersal into British Columbia and the Yukon Territory.

Rock Glaciers of the Dalton Range, Kluane Ranges, South-West Yukon Territory, Canada

1988 ◽  
Vol 34 (118) ◽  
pp. 327-332 ◽  
Author(s):  
Peter G. Johnson ◽  
Diane Lacasse
Keyword(s):  
Late Pleistocene ◽  
Lower Cretaceous ◽  
Drainage System ◽  
Upper Jurassic ◽  
Yukon Territory ◽  
High Susceptibility ◽  
Frost Action ◽  
South West ◽  
Glacier Ice ◽  
Rock Glaciers

Abstract Glaciated valleys of the Dalton Range in the south-west Yukon Territory are dominated by rock glaciers identified as glacier ice-cored debris systems. The two rock glaciers studied have different amounts of deformation at present, resulting from post-formation mechanics. The primary formation of lobes of the rock glaciers resulted from periods of glacier activity in the Neoglacial, although older lobes, probably late Pleistocene in age, occur below the Neoglacial lobes. The hydrological systems of the rock glaciers have played a major role in the post-formation deformation of the land forms and the present drainage system is entirely sub-surface. The explanation for the extensive occurrence of rock glaciers in the Dalton Range is lithological as a result of the high susceptibility of the Upper Jurassic/Lower Cretaceous sediments to frost action and glacier erosion.

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