A Middle Dorset dwelling in Trinity Bay, Newfoundland

2005 ◽  
Vol 27 (1-2) ◽  
pp. 493-513 ◽  
Author(s):  
Sylvie LeBlanc
Keyword(s):  
Radiocarbon Dates ◽  
Vast Amount ◽  
Long Period ◽  
Trinity Bay

Abstract This paper describes a Middle Dorset dwelling in Trinity Bay Newfoundland. The dwelling features an extended flagstone pavement and a well defined lateral cooking area. The vast amount of refuse associated with the dwelling, as well as the radiocarbon dates ranging between 1880 and 1300 B.P., suggest that the house was occupied for a long period of time. The occupation of the dwelling was intense and complex and stratigraphic evidence points to at least five occupational or use episodes of the dwelling site.

The Holland Paleosol: an informal pedostratigraphic unit in the coastal dunes of southeastern Lake Michigan

2004 ◽  
Vol 41 (11) ◽  
pp. 1385-1400 ◽  
Author(s):  
Alan F Arbogast ◽  
Randall J Schaetzl ◽  
Joseph P Hupy ◽  
Edward C Hansen
Keyword(s):  
Lake Michigan ◽  
Sand Dunes ◽  
Coastal Dunes ◽  
Buried Soils ◽  
Coastal Sand Dunes ◽  
Radiocarbon Dates ◽  
Long Period ◽  
Sand Supply ◽  
Buried Soil ◽  
Coastal Sand

A very prominent buried soil crops out in coastal sand dunes along an ~200 km section of the southeastern shore of Lake Michigan. This study is the first to investigate the character of this soil — informally described here as the Holland Paleosol — by focusing on six sites from Indiana Dunes National Lakeshore north to Montague, Michigan. Most dunes in this region are large (>40 m high) and contain numerous buried soils that indicate periods of reduced sand supply and comcomitant stabilization. Most of these soils are buried in the lower part of the dunes and are thin Entisols. The soil described here, in contrast, is relatively well developed, is buried in the upper part of many dunes, and formed by podzolization under forest vegetation. Radiocarbon dates indicate that this soil formed between ~3000 and 300 calibrated years BP. Pedons of the Holland Paleosol range in development from thick Entisols (Regosols) with A–Bw–BC–C horizonation to weakly developed Spodosols (Podzols) with A–E–Bs–Bw–BC–C profiles. Many profiles have overthickened and (or) stratified A horizons, indicative of slow and episodic burial. Differences in development are mainly due to paleolandscape position and variations in paleoclimate among the sites. The Holland Paleosol is significant because it represents a relatively long period of landscape stability in coastal dunes over a broad (200 km) area. This period of stability was concurrent with numerous fluctuations in Lake Michigan. Given the general sensitivity of coastal dunes to prehistoric lake-level fluctuations, the soil may reflect a time when the lake shore was farther west than it is today. The Holland Paleosol would probably qualify as a formal pedostratigraphic unit if it were buried by a formal lithostratgraphic or allostratigraphic unit.

scholarly journals Global Processes, Regional Dynamics?

2020 ◽  
Vol 47 ◽  
pp. 170-191
Author(s):  
Héctor Martínez-Grau ◽  
Reto Jagher ◽  
F. Xavier Oms ◽  
Joan Anton Barceló ◽  
Salvador Pardo-Gordó ◽  
...  
Keyword(s):  
Social Dynamics ◽  
Social Contact ◽  
Mediterranean Area ◽  
Time Interval ◽  
Radiocarbon Dates ◽  
Long Period ◽  
Regional Dynamics ◽  
Ne Iberian Peninsula ◽  
Northwestern Mediterranean ◽  
Se France

The goal of this paper is to discuss the validity of radiocarbon dates as a source of knowledge for explaining social dynamics over a large region and a long period of time. We have carefully selected c. 1000 14C dates for the time interval 8000–4000 cal BC within the northwestern Mediterranean area (NE Iberian Peninsula, SE France, N Italy) and Switzerland. Using statistical analysis, we have modelled the summed probability distribution of those dates for each of the analysed ecoregion and discussed the rhythms of neolithisation in these regions and the probability of social contact between previous Mesolithic and new Neolithic populations.

Certain Bluff Mounds of Western Jersey County, Illinois

1935 ◽  
Vol 1 (1) ◽  
pp. 6-46 ◽  
Author(s):  
P. F. Titterington
Keyword(s):  
Illinois River ◽  
Detailed Report ◽  
Vast Amount ◽  
Long Period

Archaeological interest has existed in Jersey County for a long period of time. As early as 1875, and up to about 1890, Mr. William McAdams was actively interested in collecting and excavating in Jersey, Calhoun, and Madison counties. His work was quite extensive, but unfortunately no detailed report of his Jersey County activities was made. The vast amount of material that he gathered has been widely scattered, except for a few thousand pieces which are in the Museum of the Monticello Seminary at Godfrey, Illinois. Mr. Charles A. Ruebel of Grafton has been collecting for sixty years. About one-half of his material is from Jersey County and the remainder from Calhoun County across the Illinois River. About fifty per cent of his collection was lost in a fire in 1912, and since that time the remainder has been stored and is not available for study at this time.

The Significance of Differences between Radiocarbon Dates

1958 ◽  
Vol 23 (3) ◽  
pp. 309-311 ◽  
Author(s):  
Albert C. Spaulding
Keyword(s):  
True Rate ◽  
Radiocarbon Dates ◽  
Radioactive Carbon ◽  
Long Period ◽  
Long Time

Presumably all archaeologists know that radiocarbon dates are estimates of true dates, or, more precisely, that they are derived from estimates of the true rate of emission of electrons from radioactive carbon. If it were possible to keep each specimen in the counter for an indefinitely long period or if the emissions occurred with the regularity of clock ticks, there would be no need to talk of estimates of rates. Unfortunately, the emissions do not occur at regular intervals nor is it practical to count for a very long time, so there is no escape from the uncertainty of estimation.

PROGRESS IN THE STUDY OF "MUCOVISCIDOSIS" (PANCREATIC FIBROSIS)

PEDIATRICS ◽  
1951 ◽  
Vol 7 (2) ◽  
pp. 153-163
Author(s):  
HARRY SHWACHMAN
Keyword(s):  
Pancreatic Fibrosis ◽  
Post Mortem ◽  
Vast Amount ◽  
Children's Hospital ◽  
Long Period ◽  
The Past ◽  
Pessimistic Attitude ◽  
Children’S Hospital

IN ACCEPTING the first Mead Johnson Award for the year 1949, I should like to thank those who give it and those who have participated with me in the investigation of nutritional disorders, and particularly of the disease pancreatic fibrosis. I should like to acknowledge the assistance received from Dr. Paul R. Patterson who has been associated with me in most of our studies during the past three years. Dr. May left the Children's Hospital in Boston over three years ago; it is a pleasure to be reunited with him here and to share this honor. Dr. May and I agreed that it would be difficult for us to attempt a presentation which would cover our independent activities. Instead, I should like to thank him for giving me this opportunity to tell you about some of our recent observations at the Children's Hospital. The advantages of working in an institution, in which a vast amount of energy has been expended over a long period of time in the study of pancreatic fibrosis, is quite obvious. The person most responsible for this activity and progress is Dr. Sidney Farber who has clearly presented a theory concerning the nature of the disease which after many years is being generally accepted. In 1941, he was able to refer to an experience of over 150 patients exhibiting the celiac syndrome studied at post mortem over an 18 year period. Until recently and with rare exceptions all patients with proved pancreatic fibrosis have died. Nevertheless, I should like to suggest that we have much to gain if we discard the prevailing pessimistic attitude toward this disease (pancreatic fibrosis).

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

Discussion following the presentation by F. Deubner

1977 ◽  
Vol 36 ◽  
pp. 69-74
Keyword(s):  
List Type ◽  
The Sun ◽  
Type Number ◽  
Harmonic Motion ◽  
Locally Excited ◽  
Long Period ◽  
Coherent Wave ◽  
Short Period ◽  
Global Modes

The discussion was separated into 3 different topics according to the separation made by the reviewer between the different periods of waves observed in the sun :1) global modes (long period oscillations) with predominantly radial harmonic motion.2) modes with large coherent - wave systems but not necessarily global excitation (300 s oscillation).3) locally excited - short period waves.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

TEM Analysis of Long-Period Polytypes in SiC—S

1976 ◽  
Vol 34 ◽  
pp. 630-631
Author(s):  
S. Shinozaki ◽  
J. W. Sprys
Keyword(s):  
Electron Diffraction ◽  
Isothermal Annealing ◽  
Tem Analysis ◽  
Long Period ◽  
Transmission Electron ◽  
Average Grain Size ◽  
High Resolution Tem ◽  
Structural Lattice ◽  
The Stability ◽  
Continuous Curves

In reaction sintered SiC (∽ 5um average grain size), about 15% of the grains were found to have long-period structures, which were identifiable by transmission electron microscopy (TEM). In order to investigate the stability of the long-period polytypes at high temperature, crystal structures as well as microstructural changes in the long-period polytypes were analyzed as a function of time in isothermal annealing.Each polytype was analyzed by two methods: (1) Electron diffraction, and (2) Electron micrograph analysis. Fig. 1 shows microdensitometer traces of ED patterns (continuous curves) and calculated intensities (vertical lines) along 10.l row for 6H and 84R (Ramsdell notation). Intensity distributions were calculated based on the Zhdanov notation of (33) for 6H and [ (33)3 (32)2 ]3 for 84R. Because of the dynamical effect in electron diffraction, the observed intensities do not exactly coincide with those intensities obtained by structure factor calculations. Fig. 2 shows the high resolution TEM micrographs, where the striped patterns correspond to direct resolution of the structural lattice periodicities of 6H and 84R structures and the spacings shown in the figures are as expected for those structures.

Directional observation on lipid of male nectary of Lindera megaphylla hemsl. by the rapid embedding method with polyethylene glycol (PEG)

1990 ◽  
Vol 48 (3) ◽  
pp. 718-719
Author(s):  
Dai Dalin ◽  
Guo Jianmin
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Chemical Reaction ◽  
Traditional Method ◽  
Osmium Tetroxide ◽  
Unsaturated Lipid ◽  
Embedding Method ◽  
Long Period ◽  
New Methods

Lipid cytochemistry has not yet advanced far at the EM level. A major problem has been the loss of lipid during dehydration and embedding. Although the adoption of glutaraldehyde and osmium tetroxide accelerate the chemical reaction of lipid and osmium tetroxide can react on the double bouds of unsaturated lipid to from the osmium black, osmium tetroxide can be reduced in saturated lipid and subsequently some of unsaturated lipid are lost during dehydration. In order to reduce the loss of lipid by traditional method, some researchers adopted a few new methods, such as the change of embedding procedure and the adoption of new embedding media, to solve the problem. In a sense, these new methods are effective. They, however, usually require a long period of preparation. In this paper, we do research on the fiora nectary strucure of lauraceae by the rapid-embedding method wwith PEG under electron microscope and attempt to find a better method to solve the problem mentioned above.

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