Mississippian Communities in the St. Francis Basin: A Central Place Model

The development of Mississippian settlement models for northeast Arkansas is reviewed. It is argued that a five-tier central place hierarchy best accounts for the variability currently known to exist among Mississippian communities in the St. Francis basin

Problem of Site Definition in Cultural Resource Management

The strategies employed by the Cache River Archeological Project, the Little Black Watershed Project, and the 1976 Village Creek Archeological Project with regard to site definition are compared and assessed. It is argued that both the Cache and Little Black Projects used unnecessarily restrictive definitions of cultural resources. The more liberal approach of the Village Creek Project enables both the archeological community and governmental agencies to interpret and assess better the significance and general extent of the archeological context of the cultural resource base

Expectations for the Deep Impact collision from cometary nuclei modelling

Using the cometary nucleus model developed by Espinasse et al. (1991), we calculate the thermodynamical evolution of Comet 9P/Tempel 1 over a period of 360 years. Starting from an initially amorphous cometary nucleus which incorporates an icy mixture of H2O and CO, we show that, at the time of Deep Impact collision, the crater is expected to form at depths where ice is in its crystalline form. Hence, the subsurface exposed to space should not be primordial. We also attempt an order-of-magnitude estimate of the heating and material ablation effects on the crater activity caused by the 370 Kg projectile released by the DI spacecraft. We thus show that heating effects play no role in the evolution of crater activity. We calculate that the CO production rate from the impacted region should be about 300-400 times higher from the crater resulting from the impact with a 35 m ablation than over the unperturbed nucleus in the immediate post-impact period. We also show that the H2O production rate is decreased by several orders of magnitude at the crater base just after ablation

Upper Cretaceous Cephalopoda from offshore deposits off the Natal South coast, South Africa

Dredge samples off the Natal South Coast yielded an Upper Cretaceous cephalopod fauna consisting of Eutrephoceras sphaericum geinitzi Wiedmann, 1960, Phylloceras (Hypophylloceras) woodsi woodsi Van Hoepen, 1921, Partschiceras umzambiense (Van Hoepen, 1920), Saghalinites nuperus (Van Hoepen, 1921), Saghalinites cala (Forbes, 1846), Baculites bailyi Woods, 1906, 'Bostrychoceras' indicum (Stoliczka, 1865), Hyphantoceras (Madagascarites?) amapondense (Van Hoepen, 1921), Desmophyllites diphylloides (Forbes, 1846), Hauericeras sp. cf. H. gardeni (Baily, 1855), Kossmaticeras (Natalites) africanus (Van Hoepen, 1920), and Kossmaticeras (Kossmaticeras) sp. cf. K. (K.) inornatum Collignon, 1966. This fauna is similar to that of the onshore Mzamba Formation of Natal and Transkei (Pondoland), and is dated as Middle Santonian to Lower Campanian

Anthropology and the Academy of Science: The Need for a New Role

Few anthropology papers were presented at the Annual Meetings of the Arkansas Academy of Science before 1968. Establishment of the Arkansas Archeological Survey in 1967 brought an influx of professional anthropologists to the state and a subsequent increase in the number of anthropology papers published. However, the growth in number of active anthropologists has created a need for more information channels within the state. The time is right for the Anthropology Section of the Academy to become a formal base for interaction and information dissemination among anthropologists

Distortion of Globular Clusters by Galactic Bulges

One of the external fields that influences the population of globular clusters is that due to galactic bulges. In extreme situations, perigalactic distances $r_p \le 100$ pc, globular clusters could suffer total disruption in a single passage. A more common scenario is that for cluster orbits with $r_p \ge 200$ pc. We investigate the effects of tidal forces from a bulge on the shape of globular clusters for this type of encounters. We find distortions characterized by ``twisting isophotes'' and consider the potential for observability of this effect. In the Milky Way, a typical globular cluster must pass within several hundred pc of the center to experience substantial distortion, and it is possible that this has happened recently to one or two present day clusters. We estimate that this distortion could be observed even for globulars in dense fields toward the bulge. In more extreme environments such as giant ellipticals or merger products with newly formed globulars, this effect could be more common, extending out to orbits that pass within 1 kpc of the bulge center. This would lead to a substantial shift in the eccentricity distribution of globulars in those galaxies.Comment: 12 pages, 8 figure