Diversas líneas de evidencia sugieren la existencia de dos rangos de acción de cazadores-recolectores en el sur de Patagonia meridional durante el Holoceno tardío: uno oriental, concentrado en el campo volcánico Pali Aike y otro occidental, localizado a lo largo de una franja relativamente longitudinal que va desde el sur de Lago Argentino hasta Última Esperanza. Mientras el uso de lascas y dacita predomina en el primero, la tecnología laminar y la explotación de lutita negra es recurrente en el segundo. Sin embargo, instrumentos de filo largo (raederas y cuchillos) sobre láminas de lutita negra también se registran, en baja frecuencia, en el campo volcánico Pali Aike y espacios asociados. Este trabajo evalúa, a través de las técnicas de morfometría geométrica, si estos instrumentos pertenecen a una misma población artefactual de acuerdo con sus características morfológicas. Los resultados no muestran diferencias morfológicas significativas entre los instrumentos laminares de lutita negra según su área de hallazgo (oriental versus occidental). La información morfológica y otras evidencias sobre los tamaños de los instrumentos laminares y la disponibilidad de lutita negra, cuyas principales fuentes de aprovisionamiento se localizan en el área occidental, abren la discusión sobre distintos mecanismos de interacción poblacional involucrados en la dispersión de estos artefactos.

Fluting is a technological and morphological hallmark of some of the most iconic North American Paleoindian stone points. Through decades of detailed artifact analyses and replication experiments, archaeologists have spent considerable effort reconstructing how flute removals were achieved, and they have explored possible explanations of why fluting was such an important aspect of early point technologies. However, the end of fluting has been less thoroughly researched. In southern North America, fluting is recognized as a diagnostic characteristic of Clovis points dating to approximately 13,000 cal yr BP, the earliest widespread use of fluting. One thousand years later, fluting occurs more variably in Dalton and is no longer useful as a diagnostic indicator. How did fluting change, and why did point makers eventually abandon fluting? In this article, we use traditional 2D measurements, geometric morphometric (GM) analysis of 3D models, and 2D GM of flute cross sections to compare Clovis and Dalton point flute and basal morphologies. The significant differences observed show that fluting in Clovis was highly standardized, suggesting that fluting may have functioned to improve projectile durability. Because Dalton points were used increasingly as knives and other types of tools, maximizing projectile functionality became less important. We propose that fluting in Dalton is a vestigial technological trait retained beyond its original functional usefulness.

The production of three-dimensional (3D) digital meshes of surface and computed tomographic (CT) data has become widespread in morphometric analyses of anthropological and archaeological data. Given that processing methods are not standardized, this leaves questions regarding the comparability of processed and digitally curated 3D datasets. The goal of this study was to identify those processing parameters that result in the most consistent fit between CT-derived meshes and a 3D surface model of the same human mandible. Eight meshes, each using unique thresholding and smoothing parameters, were compared to assess whole-object deviations, deviations along curves, and deviations between specific anatomical features on the surface model when compared with the CT scans using a suite of comparison points. Based on calculated gap distances, the mesh that thresholded at “0” with an applied smoothing technique was found to deviate least from the surface model, although it is not the most biologically accurate. Results have implications for aggregated studies that employ multimodal 3D datasets, and caution is recommended for studies that enlist 3D data from websites and digital repositories, particularly if processing parameters are unknown or derived for studies with different research foci.

A través de la morfometría geométrica, este estudio explora la influencia del contexto cronológico y de procedencia en la variabilidad morfológica de 75 anzuelos de concha de Choromytilus chorus provenientes de siete sitios arqueológicos de la comuna de Taltal, en la costa sur del Desierto de Atacama, Chile. Los resultados muestran diferencias significativas en las formas de los anzuelos provenientes de distintos sitios y períodos. El rasgo que explica el mayor porcentaje de variación morfológica es el largo de una de las puntas, seguido por la abertura del anzuelo. Se identifican tres momentos clave en la evolución morfológica de estos artefactos. Entre 8500 y 7500 cal aP aparecen los primeros anzuelos, predominantemente sin vástago y de abertura amplia pero variable. De 7500 cal aP en adelante, la tecnología prolifera y se diversifica: los anzuelos sin vástago y con abertura amplia siguen predominando, pero formas con vástago y abertura media también están presentes en el kit de pesca. Finalmente, entre 5500 y 4500 cal aP el número de anzuelos disminuye, desaparecen las formas circulares y se mantienen las formas con vástago, pero con abertura más estrecha. El caso de estudio de Taltal contribuye a enriquecer el conocimiento sobre la tecnología del anzuelo en concha a lo largo del Pacífico.

Recent work has demonstrated that Goshen points overlap in time with another group of unfluted lanceolate points from the Plains, Plainview points. This has raised the question of whether the two types should be kept separate or consolidated into a single type. We sought to resolve this issue by applying geometric morphometric methods to a sample of points from well-documented Goshen and Plainview assemblages. We found that their shapes were statistically indistinguishable, which indicates that Goshen and Plainview points should be assigned to the same type. Because Plainview points were recognized before Goshen points, it is the latter type name that should be dropped. Sinking Goshen into Plainview allows us to move beyond taxonomic issues and toward understanding both the spatiotemporal variation that exists among Plainview assemblages and what it can tell us about the adaptations and social dynamics of Plainview groups.

The existence of sexual dimorphism in the Minorcan horse, an autochthonous breed from Minorca Island in the Balearic archipelago (NW Mediterranean Sea), is established in the official standard, with females being shorter and longer than males as well as having slenderer necks and a squarer croup. However, no study so far has explored the size and shape components of this dimorphism separately. The aim of this study was to analyse the morphology of this breed using geometric morphometric methods in order to find size and shape differences between sire lines. The analysis was based on landmarks digitized in lateral view from 38 registered adult Minorcan horses (20 males and 18 females) within an age range of 3–14 years (average 7 years) with different performance goals. The analyses did not reveal any significant differences between the “shape” and “size” of male and female animals, for the landmarks studied, so the sexes are functionally similar.