A Possible Paleo-Indian and Archaic Site in the Swan Valley,Manitoba

Abstract

An archaeological site uncovered in the Swan Valley of Manitoba during road construction yie1ded a small group of artifacts including a Paleo-Indian projectile point and side-notched Archaic points. The site is significant as it lies in a corridor which probably served as a vital migration route between the Northern Plains and the diminishing lakes within the Lake Agassiz Basin.     

The Strohacker Site: A Review of Pre-Archaic Manifestations in Texas

Abstract

Investigations at the Strohacker site in central Texas produced a number of late Paleo-Indian and pre-Archaic artifacts. These are described and the site is compared to several other Texas sites from which similar artifacts were recovered in recent years. On the basis of present evidence, it is proposed that the latter part of the Paleo-Indian period ended in parts of Texas around 6000 B.C. and was followed by a transitional preArchaic phase which extended throughout the Altithermal. This phase was succeeded by a developed Archaic tradition about 3500 B.C.     

A Progress Report on a Pre-Ceramic Site at Rattlesnake Draw Eastern New Mexico

Abstract

The Rattlesnake Draw site has produced both Paleo-Indian and Archaic artifacts in a concentrated area centering about a presently dry lake basin. In addition to the artifacts discovered, the investigators have found evidence of the construction of artificial wells during the archaic period. These wells are similar to those earlier discovered at Blackwater Draw, Locality One.     

Three Small Points: A Cody Complex Problem

Abstract

Three small points which resemble larger Cody Complex projectile points are related to this Complex on the basis of technological and shape attributes. It is concluded that several factors underlie occurrence of tiny Cody points. Resharpening of larger points accounts for one pattern. In addition, diminutive points were produced using two alternative sets of technological procedures. It is suggested that these points were not used in subsistence activities and may reflect ceremonial or symbolic activities practiced by late Paleo-Indian bison hunters.     

A Paleo-Indian Point From Henry County,Missouri

Abstract

A Paleo-Indian point, probably assignable to the Plano Tradition, was recently collected in Henry County, Missouri. Although unfluted, it otherwise compares favorably both morphologically and technologically with several published samples of PaleoIndian points. The upland location also compares . favorably with known Paleo-Indian site locations; however, geomorphic processes may have biased recording of Paleo-Indian sites.     

The Pelland and Moe Site Blades: Paleo-Indian Culture History in the Upper Midwest

Abstract

Analysis of artifacts recovered from the Moe site located in northwestern North Dakota reveals the presence of 15 blades and three blade-like flakes, the majority of which are made of Knife River Flint and have been modified by retouch flaking. A comparison of the Moe specimens to those from the Pelland site in northern Minnesota, the only other site from the study area which contains blades of Paleo-Indian age, indicates that the Moe specimens are smaller in all dimensions. The Pelland specimens are made of Knife River Flint and have been modified by retouch flaking. Examination of the literature on Paleo-Indian sites from the Plains region indicates that blade production is more common in Plano cultures particularly Agate Basin and Plainview-Goshen than in earlier Clovis or Folsom cultures or later Cody cultures. It is suggested that the Pelland and Moe site blades are Plano in age and most likely Agate Basin or Plainview-Goshen in cultural affiliation. A model provided by Leo Pettipas (1976) is used to suggest an eastward movement of Plains Plano cultures using Knife River Flint across southern Manitoba, eastern North Dakota, and into western and northern Minnesota following the recession of Glacial Lake Agassiz.     

The Simonsen Site: Report For the Summer Of 1959

Abstract

Isolated surface finds of probable Archaic and Paleo-Indian sites have been made in western Iowa for the past decade. Recently 3 sites have been found in this area, along tributaries of the Missouri River, containing cultural material buried in sediments 13-17 feet below the modern surface. One of these sites, the Simonsen, exposed on a loop of the Little Sioux River, is described.

Bison bones were eroding below the top of an alluvial terrace. This profile is divided into 8 stratigraphic zones, Zones 1 and 2, were 9 feet thick and composed of sterile loam, sand and gravels. Zone 3, contained several disintegrated bison bones, fine ash, burned earth, a fire pit with charred log fragments and a hearth containing a large canid but no artifacts. Zone 4, 1-2 feet thick was composed of sterile interbedded gravels and sand. Zone 5, from a few inches to 2 feet thick contained small flecks of charcoal, and a fragment of a projectile point. Zone 6 was a very stilty sand interbedded with sand silts. Zone 7, 2-3 feet thick was the most profilic source of cultural material but considering the large area exposed, produced few artifacts. These were knives, flakes, 2 anvil stones and 3 points. Zone 8, a gravelly deposit of unknown thickness, underlay the cultural deposits.

A total of 7 bison skulls or partial skulls were collected in addition to abundant remains of other parts of the skeletons. These remains were tentatively assigned to the extinct specie, Bison occidentalis. Measurements of the metapoidals of these specimens agreed in massiveness with those from Scottsbluff and were smaller than specimen from the Brewster and Lipscomb sites which contained bison antiquus and Folsom artifacts.

The 1959 collection from the Simonsen site supports earlier observations of affiliations with the Logan Creek Site of Nebraska and argues for assignment within the late Paleo-Indian to early Archaic horizon.     

DhLB-1: Early Period Occupation Near Glacial Lake Agassiz,Southeast Manitoba

Abstract

Dhlb-1 is a Paleo-Indian site situated just north of the International Boundary in southeastern Manitoba. It was excavated in 1972, and found to be an area of tool manufacturing. It was dated by association with a gravel lens, deposited shortly after the formation of the Campbell strandline, 9,500 to 10,000 years B.P. The site is of significance because it demonstrates early period migration into southeastern Manitoba immediately after Lake Agassiz withdrawal.     

Some Important Developments in Northern Plains Prehistory, 1942-1967*

Abstract

The area of the Northern Plains is defined as by Wedel in his 1961 synthesis. For the period under consideration, the “process” of archeological work is presented in terms of two main areas of growth--the River Basin Survey Program and the opening up of intensive work in Canada. Also for the period considered, the “results 11 of archeological work are presented in terms of the following eight areas of both fact and theory development: 1) The Middle Missouri “Plains Village” development; 2) Paleo-Indian diversity; 3) Meso-Indian gap filling; 4) Projectile points as diagnostics; 5) Functional interpretations; 6) Ecological prespectives; 7)Relationships outsidethePlains; 8) Broad-ranging synthesis. Future developments are seen in the need and possibilities for historic work, preparation of syntheses and the deeper development of micro-analytic approaches.     

Late Paleo-Indian Activity At The Lubbock Lake Site

Abstract

Excavations at Lubbock Lake (41 LU1), Southern High Plains of Texas, revealed the presence of a complex, late Paleo-Indian feature containing a camping area and bison (Bison antiquus) kill/butchering locale. The feature is found within a cienega or marsh deposit and dates from 8300 to 8600 years. At least two camping episodes are indicated, separated by the kill/butchering event. Camp debris consists of a projectile point midsection, unifacial and bifacial tools, and flakes. Faunal debris includes remains of butchered pronghorn antelope, rabbits, ducks, grouse, and turtles. The kill/butchering locale contains remains of four bison and three fetuses, a bone expediency tool, a reworked projectile point base, unifacial butchering tools, and flakes. Projectile points, other lithic tools, and age of the feature indicate a Firstview occupation. From faunal and geologic data, site environs are reconstructed as a marshlands rimmed by a narrow border of wet meadows grading into a mixed grass prairie. Although several late Paleo-Indian kill/butchering locales are known on the Southern High Plains, this feature is the first late Paleo-Indian camp.     

Pryor Stemmed: A Specialized Late Paleo-Indian Ecological Adaptation

Abstract

One of the late Paleo-Indian cultural groups in the Bighorn-Pryor Mountains area of southern Montana and northern Wyoming is characterized by a lanceolate projectile point with a distinctive alternate beveling on blade edges. Present evidence indicates a settlement pattern restricted to the mountains and foothills and an intense hunting and gathering subsistence strategy. They appear also to have been separate from contemporary cultural groups on the open high plains. A number of site investigations and radiocarbon dates indicate that this cultural group of around 8000 years ago and referred to as Pryor Stemmed was probably about the last of the late Paleo-Indian cultural complexes in the area.     

Interaction Parameters and the Demise of Paleo-Indian Craftsmanship

Abstract

Interaction plays a central role in archaeological interpretations, yet it has remained theoretically underdeveloped and has often been misused. A framework for dealing with interaction is presented, consisting of: 1) ultimate adaptive conditions for interaction; 2) specific reasons for various types of interaction; 3) modifications of interaction due to aspects of the social matrix; 4) interaction mechanisms; and 5) the artifact patterns resulting from all of these factors. It is clear that “interaction” cannot be treated as a monolithic phenomenon; rather there are many types of interaction with many different outcomes for artifact patterning. The transition from the Paleo-Indian to Archaic stages is analyzed within this framework, and it is suggested that in the simplified interaction context of generalized hunter/ gatherers the size of interaction networks is largely a function of resource reliability and the relative need to maintain subsistence-related alliances between bands.     

A Human Skeleton From The Pryor Creek Burial, 24YL404, Yellowstone County,Montana

Abstract

An adult human skeleton, found associated with artifacts of both Indian and White manufacture near Billings, Yellowstone County, Montana, is thought on the basis of cranial measurements and morphological features to be a prehistoric Crow Indian.     

a Reexamination of Spring Deposited Lithics from Blackwater Draw Locality N0.1

Abstract

Archaeological’ excavations at Blackwater Draw Locality No. 1 from 1962 to 1964 uncovered a number of spring conduits. Several of these contained very high concentrations of Paleo-Indian lithic materials, which exhibited a high polish on their surfaces. Investigations of this phenomenon (Haynes and Agogino 1966) have suggested thatthe distributions and concentration of lithics within spring conduits. are the result of intentional discard (possibly through ritual activity) by Paleo-Indians.     

Burned Rock Midden Sites on the Southwestern Edge of the Edwards Plateau,Texas

Abstract

Data from two groups of burned rock midden sites are presented. Occupation of the sites seems to have been heaviest during Archaic times, with some Late Prehistoric and possible Paleo-Indian components also recognized. A burial is described from one site. Problems pertaining to burned rock midden sites are briefly discussed.     

On The Significance of Additional Radiocarbon Dates from Bonfire Shelter,Texas

Abstract

Two hitherto unreported dates from charcoal samples associated with remains attributed to a Paleo-Indian bison kill at this site are provided. These dates further substantiate a minimal antiquity of ca. 10,000 years for the deposit and, by inference, give evidence of the use of a “bison jump” technique of hunting at this early time period. Definitional problems, differing views on the antiquity, basic comparability of cited examples, and temporal continuity of this mode of mass killing are briefly discussed. Some suggestions are made as to the cultural implications made probable by acceptance of an early date for this practice.     

Characterization of displacement forces and image artifacts in the presence of passive medical implants in low-field (<100 mT) permanent magnet-based MRI systems,and comparisons with clinical MRI systems

PurposeTo investigate the displacement forces and image artifacts associated with passive medical implants for recently-developed low-field (<100 mT) MRI systems, and to compare these with values from higher field strengths used for clinical diagnosis.MethodsSetups were constructed to measure displacement forces in a permanent magnet-based Halbach array used for in vivo MRI at 50 mT, and results compared with measurements at 7 T. Image artifacts were assessed using turbo (fast) spin echo imaging sequences for four different passive medical implants: a septal occluder, iliac stent, pedicle screw and (ferromagnetic) endoscopic clip. Comparisons were made with artifacts produced at 1.5, 3 and 7 T. Finally, specific absorption rate (SAR) simulations were performed to determine under what operating conditions the limits might be approached at low-field.ResultsDisplacement forces at 50 mT on all but the ferromagnetic implant were between 1 and 10 mN. Image artifacts at 50 mT were much less than at clinical field strengths for all passive devices, and with the exception of the ferromagnetic clip. SAR simulations show that very long echo train (>128) turbo spin echo sequences can be run with short inter-pulse times (5–10 ms) within SAR limits.ConclusionsThis work presents the first evaluation of the effects of passive implants at field strengths less than 100 mT in terms of displacement forces, image artifacts and SAR. The results support previous claims that such systems can be used safely and usefully in challenging enviroments such as the intensive care unit.     

Cody Knives and the Cody Complex in Plains Prehistory: A reassessment

Abstract

Discovery of the oldest dated Cody Knife in the New World calls for a redefinition of the Cody Complex in High Plains prehistqw. Its greater antiquity plus its association with an earlier culture gives new insight into the developmental sequence of certain Paleo-Indian tools.     

Iterative image reconstruction using modified non-local means filtering for limited-angle computed tomography

PurposeLimited-angle CT imaging is an effective technique to reduce radiation. However, existing image reconstruction methods can effectively reduce streak artifacts but fail to suppress those artifacts around edges due to incomplete projection data. Thus, a modified NLM (mNLM) based reconstruction method is proposed.MethodsSince the artifacts around edges mainly exist in local position, it is possible to restore the true pixels in artifacts using pixels located in artifacts-free regions. In each iteration, mNLM is performed on image reconstructed by ART followed by positivity constraint. To solve the problem caused by ART-mNLM that there is undesirable information that may appear in the image, ART-TV is then utilized in the following iterative process after ART-mNLM iterates for a number of iterations. The proposed algorithm is named as ART-mNLM/TV.ResultsSimulation experiments are performed to validate the feasibility of algorithm. When the scanning range is [0, 150°], our algorithm outperforms the ART-NLM and ART-TV with more than 40% and 29% improvement in terms of SNR and with more than 58% and 49% reduction in terms of MAE. Consistently, reconstructed images from real projection data also demonstrate the effectiveness of presented algorithm.ConclusionThis paper uses mNLM which benefits from redundancy of information across the whole image, to recover the true value of pixels in artifacts region by utilizing pixels from artifact-free regions, and artifacts around the edges can be mitigated effectively. Experiments show that the proposed ART-mNLM/TV is able to achieve better performances compared to traditional methods.