Response to a comment by Jorgeson, Breslawski and Fisher on “The Younger Dryas impact hypothesis: Review of the impact evidence” by Sweatman

This chapter reviews the significant features of early prehistoric occupations of the Southeastern U.S. Coastal Plain. Along with the Pleistocene age archaeological sites, salient aspects of the geology, including sea level positions, are presented. Possible Pre-Clovis sites dating from pre-LGM to late Pleistocene times are considered. Clovis is seen to have a Coastal Plain settlement focus that includes the now-drowned shelf. The dramatic onset of the Younger Dryas and its potential effects on people, including the “Younger Dryas Impact Hypothesis,” are reviewed.

Download Full-text

The Modern Form of the Impact Hypothesis of Lunar Relief Formation

XIIIth International Astronautical Congress Varna 1962 ◽

10.1007/978-3-7091-4688-0_2 ◽

1964 ◽

pp. 11-20 ◽

Cited By ~ 3

Author(s):

B. J. Levin

Keyword(s):

Relief Formation ◽

The Impact ◽

Modern Form ◽

Impact Hypothesis

Download Full-text

Of Meuse and Man: the geomorphogenetic and archaeological predictive maps of the Dutch Meuse valley

Netherlands Journal of Geosciences – Geologie en Mijnbouw ◽

10.1017/njg.2017.5 ◽

2017 ◽

Vol 96 (2) ◽

pp. 183-196 ◽

Cited By ~ 1

Author(s):

R.F.B. Isarin ◽

E. Rensink ◽

G.R. Ellenkamp ◽

E. Heunks

Keyword(s):

Land Use ◽

Younger Dryas ◽

The Holocene ◽

The North ◽

Aeolian Geomorphology ◽

Landscape Processes ◽

Cultural Themes ◽

Human Habitation ◽

The Impact ◽

First Time

AbstractFor the first time, geomorphology and archaeology are combined for a 165 km long stretch of the Meuse river, resulting in a geomorphogenetic map (GKM) and a series of archaeological predictive maps (AVM). The maps cover the central part the Meuse valley, located in the province of Limburg between Mook in the north and Eijsden in the south. The area consists of fluvial and aeolian landforms of the Holocene Meuse floodplain and Younger Dryas aged terraces along it, spanning a period of approximately 15,000 years of landscape genesis and human habitation. The GKM more clearly discriminates between map units of Younger Dryas and early Holocene age than in previous mappings of the Meuse valley. The AVM series provide predictive information on the location of sites for four distinct consecutive archaeological periods and four main cultural themes. The maps contribute to a better understanding of landscape processes (fluvial and aeolian geomorphology and the impact of man on river behaviour), and the possibilities for human habitation and land use in prehistoric and historic times.

Download Full-text

Rigid body collisions with friction

Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences ◽

10.1098/rspa.1990.0125 ◽

1990 ◽

Vol 431 (1881) ◽

pp. 169-181 ◽

Cited By ~ 172

Keyword(s):

Energy Dissipation ◽

Rigid Body ◽

Rigid Bodies ◽

Consistent Theory ◽

Contact Points ◽

Collision Processes ◽

Inconsistent Theory ◽

The Impact ◽

Impact Hypothesis ◽

Alternative Theories

An energetically consistent theory is presented for dynamics of partly elastic collisions between somewhat rough rigid bodies with friction that opposes slip. This theory is based on separately accounting for frictional and non-frictional sources of dissipation. Alternative theories derived from Newton’s impact law or Poisson’s impact hypothesis are shown to be valid only for central (collinear) or non-frictional collisions; generally the latter theories yield erroneous energy dissipation if small initial slip stops during collision between eccentric bodies. Collision processes are complex when small slip is stopped by friction; then either the direction of slip reverses or contact points roll without slip. An inconsistent theory based on Newton’s impact law can yield erroneous energy increases when slip stops during collision; the consistent theory always dissipates energy. The impact law that specifies a simple proportionality between normal components of contact velocity for incidence and rebound is not applicable in any range of incident velocities with small slip if the collision is non-collinear with friction. In Percussion the force or Impetus whereby one body is moved may cause another body against which it strikes to be put in motion, and withal lose some of its strength or swiftness. (J. Wallis, 1668)

Download Full-text

Brief Overview of the Younger Dryas Cosmic Impact Datum Layer 12,800 Years Ago and Its Archaeological Utility

Early Human Life on the Southeastern Coastal Plain ◽

10.5744/florida/9781683400349.003.0008 ◽

2018 ◽

pp. 155-174 ◽

Cited By ~ 1

Author(s):

Malcolm A. LeCompte ◽

A. Victor Adedeji ◽

James P. Kennett ◽

Ted E. Bunch ◽

Wendy S. Wolbach ◽

...

Keyword(s):

North America ◽

Younger Dryas ◽

Cobalt Chromium ◽

Nickel Cobalt ◽

Climatic Period ◽

Dating Methods ◽

The Impact

Chapter 8 reviews the evidence for a suspected cosmic impact over North America at the onset of the Younger Dryas climatic period with the near simultaneous extinction of classic Pleistocene megafauna and the Clovis technoculture. The impact related proxies that are used to detect the impact layer, such as spherules, silica-rich glass, nanodiamonds, carbon, and geochemical enrichment of nickel, cobalt, chromium, iridium, platinum and osmium, are considered. This layer is offered as a useful chronostratigraphic marker for recognizing the YDB boundary in the absence of other dating methods.

Download Full-text