[+info] VOLUME 5. ISSUE 1. 2007 (1 issue)

Analysis of the faunal remains from KV502, a Later Stone Age occupation site in Namaqualand, South Africa yielded an assemblage dominated by micromammal cranial remains. The material from KV502 was compared to an assemblage of microfauna collected from the stomach area of a human burial from the same general region. This consisted entirely of post-crania. The pattern of relative abundance of elements, the degree of fragmentation of the long bones, and the level of acid etching observed in the remains of the human burial can be used to identify micromammals consumed by humans. The complementary pattern (or evidence) for processing micromammal remains by humans is identified at KV502. Further, it was determined that from the degree of modification to the bones, humans should be considered a category 5 predator following Andrews' (1990) classification. This increases the database of possible predators of micromammals, which is important when using microfauna to determine palaeoenvironments, as the preferential 'tastes' of a predator will bias the species list.

[+info] VOLUME 5. ISSUE 1. 2007 (3 issue)

For a better understanding of the fossilization processes and the paleoenvironmental records, knowing the state of preservation of fossil structures is essential. This paper presents how the analysis of tooth structures can be improved by using techniques increasing spatial resolution and accuracy, like atomic force microscopy (AFM). Micro- and nanostructural changes of the fresh and fossil dentine and enamel of two Suidae were thus observed with scanning electron (SEM) and atomic force microscopes. AFM and SEM show similar images for enamel and dentine in fresh teeth, whereas discrepancy occurs for fossil teeth. Both techniques show that dentine is modified by taphonomic and diagenetic processes, but only AFM is able to reveal that enamel is also altered, because AFM magnification and resolution are better than SEM ones. The apparent state of tissue preservation depends on the scale of observation and AFM, an analytical tool and a non-destructive/direct technique, allows a better understanding of the evolution of tissues at a nano-scale.

[+info] VOLUME 5. ISSUE 2. 2007 (1 issue)

Grey fox (Pseudalopex griseus) scats deposited in the immediate vicinity of guanaco (Lama guanicoe) carcasses were analyzed to evaluate this carnivore´s transport of bones. Samples were from the arid, semi-desert Río Negro Province, Argentina, where the annual mean temperature (15ºC) varies widely with the season. Rates of breakage, the presence of tooth marks and digestion traces on bones from scats were analyzed to categorize the taphonomic signature of the small grey fox. The values of the modification variables used in the categorization indicate that the grey fox (Pseudalopex griseus) may be considered a Category 5 predator.

[+info] VOLUME 5. ISSUE 2. 2007 (2 issue)

The siliceous sponges in the Oxfordian-lowermost Kimmeridgian deposits of the Prebetic were important rock-forming organisms, and the most important in the spongiolithic lithofacies group. The siliceous sponges were in several cases the main component in macroinvertebrate assemblages. This taphonomic analysis shows the sequence of processes that occur in the fossilization of siliceous sponges.As soon as the sponge is dead, the fixation to the substrate is weakened and currents or organisms can tilt and overturn the sponge. The decay of soft tissue led to the precipitation of automicrites (possibly influenced by sulphate-reducing bacteria); at the same time skeletal silica dissolves where, later, the calcitic cementation is produced. Afterwards, the sponge remains were bored by lithophagous bivalves and colonized in the upward surfaces by benthic microbial communities and nubeculariids, and secondarily other foraminifera, whereas downward surfaces were encrusted by annelids (serpulids and terebellids), sessile foraminifera (Tolypammina, Subdelloidina, and Bullopora among others) and bryozoans. Local fragmentation of sponges and their encrustations formed the tuberoids, which behave like an intraclast subjected to transport and encrustation.

[+info] VOLUME 5. ISSUE 3. 2007 (1 issue)

We study the processes of laminae formation in the Oligo-Miocene volcano-sedimentary palaeolakes of the Gürçü-Dere Valley (Anatolia, Turkey). These deposits contain a rich macro- and micro-flora and vertebrate and insect fauna. The deposition and fossilisation of these organisms' remains are related to the development of the lakes' surface and bottom microbial mats. These strata are made of two types of rhythmite or varve, imitating dark and clear laminae sequences. The first type is (detritic + organic material) / diatoms at the Bes-Konak palaeolake, probably not of seasonal origin (rhythmite), but providing evidence of short ecological 'mini-catastrophes', a few weeks long, in confined environments. The second type is (diatoms + organic matter) / dolomite at the Iybeler palaeolake, probably of seasonal origin (varve). For the first time, we show that fossil insects, i.e. the Notonecta spp., are highly relevant to determining the relative duration and mechanisms of the depositions of these laminae.

[+info] VOLUME 5. ISSUE 3. 2007 (2 issue)

Numerous experiments on modern bone assemblages have demonstrated that carnivores preferentially ravage bone portions that have high fat content such as ribs, vertebrae, pelves, and the spongy ends of long bones. If marrow is present in long bones, carnivores will break them to access it. If humans remove the marrow first, carnivores typically ignore midshaft fragments and focus on spongy portions that contain bone grease. These portions are swallowed and the grease is extracted within the gut. Many modern human groups regularly implement bone boiling technology to extract grease, and this technology is also known to have existed during the Late Pleistocene and Holocene - particularly among high-latitude hunter-gatherer groups. Because most actualistic studies of bone surface modification and carnivore bone portion choice are based on unboiled bones, the results may not be applicable to archaeological assemblages in which bone boiling technology was utilized. An experimental evaluation of the effects that bone boiling has on carnivore bone portion choice and relative proportions of human and carnivore bone surface modification indicates that; 1) The extraction of bone grease from bone ends during boiling, particularly prolonged boiling, causes carnivores to become less selective in bone portion choice; and 2) As a likely result of this decreased selectivity, the relative proportions of tooth- and percussion-marked midshaft fragments in heavily boiled assemblages (those boiled longer than 10 hours) is not likely to remain a reliable indicator of the timing of carnivore and human interaction with an assemblage.

[+info] VOLUME 5. ISSUE 3. 2007 (3 issue)

Differences amongst ungulate body-size classes in archaeofaunal assemblages are frequently used to infer economic structure, human transport and processing decisions, or pre-burial taphonomic processes. It was found that bones of larger ungulates (fallow deer, Dama mesopotamica) are generally more fragmented than analogous elements of smaller ungulates (mountain gazelle, Gazella gazella). This pattern is consistent across several Levantine Paleolithic and Epipaleolithic bone assemblages and does not stem from recovery or identification biases, or from animal-induced taphonomic causes such as carnivore ravaging. We suggest that the greater fragmentation of larger animals is an artifact of either differential human processing of large and small animals, or of post-depositional attritional processes. Our analysis points to the greater likelihood of the latter scenario. We conclude that inter-taxonomic comparisons should consider the possibility that key zooarchaeological measures may be biased due to differential size-related fragmentation, affecting inferences on human behavior, taphonomic processes, and paleoenvironments.

[+info] VOLUME 5. ISSUE 4. 2007 (1 issue)

The aim of this paper is to present and discuss methodological criteria that may be of use in exploring the role of water in the formation of the faunal record in fluvial and lacustrine environments. As such, the dispersion potential of the bones of adult and neonate guanaco (Lama guanicoe) skeletons in an aquatic environment with very low hydraulic energy is evaluated through experimentation. Results of the experiments are integrated with other, complementary criteria and applied to the bone assemblage recovered at Paso Otero 1 site, situated on the margin of the ancient flood plain of the Quequén Grande River (Buenos Aires Province, Argentina). The results of this study indicate that water was the main agent responsible for guanaco bone accumulation at the site. It is proposed that some of the skeletal parts, which belong to guanaco carcasses that were processed and exploited by hunter-gatherers in areas close to the site, were added to those from animals that died naturally. This resulted in a mixture of material of both natural and anthropic origin.

[+info] VOLUME 5. ISSUE 4. 2007 (2 issue)

Preliminary taphonomic studies were conducted on three different early hominid Chadian sites aged between 5 Ma and 3 Ma (KB, KL, KT fossil areas). Specific excavations and taphonomic sampling protocols were established. Research of the various alterations and the origins of bone modifications were carried out. All fossil assemblages bear traces of carnivore tooth marks as well as weathering and wind/water polishing. Digestion is present on bones from the KB & KL sites. Rootmark traces were found only on bones from the KB and KT sites. All three sites display various polishing patterns among which much of the abrasion results from wind polishing on the top surface, on the exposed face of large flat bones difficult to move. By contrast water action works on all faces of polished bones. KL seems to show more water transport influence than the two other sites. Weathering stages are light to heavy (stages 2-4) and the presence of gnawing, and traces of roots plus tooth marks indicates that bones stayed sometimes on the soil surface and that the assemblages may be of attritional origin. But the low density of bones and the presence of a very thin fossil layer are very exceptional and it is not clear weather the fossil sites have been condensed during the past or if this is the result of present day extreme desert conditions. More detailed work on other Djourab sites should allow to refine the taphonomic history concerning these early hominid accumulations and formation.

[+info] VOLUME 5. ISSUE 4. 2007 (3 issue)

This study documents the occurrence of brachiopod shells (Bouchardia rosea) in wrack-lines from backshore deposits of a tropical beach (Itamambuca beach), in the northern coast (Ubatuba County) of the state of São Paulo, Brazil. The main goals are: (a) to analyze the provenance and sorting of the brachiopod shells; (b) to provide the taphonomic signatures of the shells, which may favor the recognizance, description and diagnoses of similar shell concentrations in ancient rocks, and (c) to discuss the taphonomic meaning of these detrital accumulations. Sampling transects were done at the reflective and dissipative sectors of the Itamambuca beach. For this project, two thousand brachiopod shells were collected and examined. In general, shells are minute, pale in color, and extremely rounded with reduced shell micro-relieves. Abrasion is the main taphonomic signature recorded. Abraded shells are characterized by V-shaped scars on the external surface, exposing the secondary fibrous layer of the shell microstructure. In some cases, holes produced by abrasion (facets) are recorded in the most convex portion of the shells. A pronounced bias in favor of ventral valve is also noted, and the size frequency distribution of shells is shaped by taphonomy. Finally, shells show intense taphonomic overprinting, but the taphonomic signatures recorded on those shells are worth to provide valuable clues about the taphonomic pathways and spatial transportation of each bioclast.

Year 2007 Archives - Journal of Taphonomy

Volumen 5. Issue 1. Year 2007.

Volumen 5. Issue 1. Year 2007.

Alberto2020-03-28T19:18:24+02:00octubre 26th, 2019|Volumen 5. Issue 1. Year 2007.|

Micromammals: When Humans are the Hunters.

Genevieve Dewar, Antonietta Jerardino.

Keywords: MICROMAMMALS, SOUTH AFRICA, HUMANS, PREDATORS, LATER STONE AGE, DIET, SUBSISTENCE

Volumen 5. Issue 1. Year 2007.

Micromammals: When Humans are the Hunters.

Quantification and Age Structure of Semi-Hypsodont Extinct Rodent Populations.

Estimating the preservation of tooth structures: towards a new scale of observation.

The Taphonomist´s Corner: Make hay while the sun shines.

Volumen 5. Issue 2. Year 2007.

Taphonomic Analysis of Pseudalopex griseus (Gray, 1837) Scat Assemblages and their Archaeological Implications.

Taphonomy of the Oxfordian-Lowermost Kimmeridgian Siliceous Sponges of the Prebetic Zone (Southern Iberia).

A Multidisciplinary Approach Reveals an Extraordinary Double Inhumation in the Osteoarchaeological Record.

The Taphonomist´s Corner: Dirty Landing.

Volumen 5. Issue 3. Year 2007.

The Aquatic Genus Notonecta (Insecta: Heteroptera) as a Palaeo-ecological Indicator of Rhythmite Miming Sequences in Shallow Freshwater Deposits.

Carnivore Bone Portion Choice and Surface Modification on Modern Experimental Boiled Bone Assemblages.

Differential Fragmentation of Different Ungulate Body-Size: A Comparison of Gazelle and Fallow Deer Bone Fragmentation in Levantine Prehistoric Assemblages.

The Taphonomist´s Corner: Chasing carnivores.

Volumen 5. Issue 4. Year 2007.

Criteria for the Identification of Formation Processes in Guanaco (Lama guanicoe) Bone Assemblages in Fluvial-Lacustrine Environments.

Taphonomy in Present Day Desertic Environment: The Case of the Djourab (Chad) Plio-Pleistocene Deposits.

Brachiopod Shells on the Beach: Taphonomic Overprinting in a Fair-Weather Shell Accumulation.

The Taphonomist´s Corner: Taphonomy and praxis.