EurekaMag
+ Translate
+ Most Popular
Gaucher's disease;thirty-two years experience at Siriraj Hospital
A study of Macrobathra Meyrick from China (Lepidoptera, Cosmopterigidae)
First occurrence in ores of tetragonal chalcocite
Effects of trace element nutrition on sleep patterns in adult women
N.Z. range management guidelines. 2. Design of grazing management systems for tussock country
A case of lipoma of the esophagus
A revision of world Acanthosomatidae (Heteroptera: Pentatomidae): keys to and descriptions of subfamilies, tribes and genera, with designation of types
Life history of the coronate scyphozoan Linuche unguiculata (Swartz, 1788)
Perceptual restoration of obliterated sounds
Mutagenicity studies on two chromium(III) coordination compounds
The formation of the skeleton. I. Growth of a long bone. 1st appearance of a center of calcification
Leucopenia and abnormal liver function in travellers on malaria chemoprophylaxis
The joint commission: four key root causes loom large in sentinel event data
Treatment of vitiligo with topical 15% lactic acid solution in combination with ultra violet-A
Behaviour of dairy cows within three hours after feed supply: I. Influence of housing type and time elapsing after feed supply
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Management and control of patients with type 2 diabetes mellitus in Lebanon: results from the International Diabetes Management Practices Study (IDMPS)
The diet composition and nutritional knowledge of patients with anorexia nervosa
Physoporella croatica Herak, 1958 of the Slovak karst Anisian (Slovakia, the West Carpathians Mts.)
Bright lights, big noise. How effective are vehicle warning systems?
Ein Plesiosaurier-Rest mit Magensteinen aus mittlerem Lias von Quedlinburg
Incidence of Chlamydia trachomatis in patients with sterility
Monster soup: the microscope and Victorian fantasy
Preliminary tests with residual sprays against poultry lice
Duration of the life of plants in phylogeny

Structure-filling stratigraphy of the Late Cretaceous Wetumpka marine-target impact structure, Alabama


Structure-filling stratigraphy of the Late Cretaceous Wetumpka marine-target impact structure, Alabama



Abstracts with Programs - Geological Society of America 38(3): 82



Wetumpka impact structure is the only known impact feature in the inner coastal plain of the southeastern U.S. Wetumkpa is a deeply eroded, arcuate, 7.6-km diameter Late Cretaceous feature located near the fall line in Elmore County, Alabama. This distinctive structure was produced by a cosmic impact into shallow marine water, probably less than 30 m deep. Wetumpka has three distinctive surficial geologic terrains produced by impact-related processes. These exposed terrains include Wetumpka's crystalline rim and two sedimentary terrains: (a) an interior unit comprised of impactite sands and broken sedimentary target formations (also known as the resurge unit, or the Wetumpka Melange), and (b) an adjacent extra-structure unit (or the structurally deformed unit). This deformed unit is located only outside the rim on the structure's southern and southwestern sides. Core drilling near the structure's geographic center revealed that Wetumpka's structure fill has a distinctive (unnamed) subsurface unit as well. Drilling initially penetrated the upper, resurge-deposited unit ( approximately 60 m thick; same as the "interior unit" above), but at depth encountered an underlying lower, structure-filling breccia unit comprised of fall-back ejecta layers, slumped target-rock blocks, and wash-back sandy breccias and sands. This unique subsurface unit, approximately 130 m thick, contains shocked minerals within the fine clastic matrix. Drilling did not penetrate the full thickness of the unnamed breccia but the breccia likely grades into an autochthonous bedrock breccia, which characterizes the deepest reaches of most complex terrestrial impact structures.

Accession: 020138290

Download citation: RISBibTeXText

Related references

Structure-filling stratigraphy of the marine-target Wetumpka impact structure, Alabama, USA. Open-File Report - U S, 2004

Wetumpka impact structure (Alabama), a Late Cretaceous marine-target crater. Abstracts with Programs - Geological Society of America 32(7): 161, 2000

Structure-filling sediments of the Wetumpka marine-target impact structure; Alabama, USA. Pages 97-113 2004, 2004

Paleobiologic effects of the Late Cretaceous Wetumpka marine impact, a 7.6-km-diameter impact structure, Gulf Coastal Plain, USA. Pages 121-142 2006, 2006

Stratigraphy drilled at Wetumpka impact structure, Alabama. Abstracts with Programs - Geological Society of America 34(6): 318, 2002

Shallow subsurface stratigraphy of Wetumpka impact structure, Alabama USA. Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 42: 2335, 2011

An U-Th/He age for the shallow-marine Wetumpka impact structure, Alabama, USA. Meteoritics and Planetary Science 47(8), 2012

Marine impact craters on Earth; field investigation of the Wetumpka impact structure, a well-preserved marine impact crater, and the K-T boundary in the Alabama Gulf Coastal Plain. GSA Today 17(9): 57-58, 2007

Upper Cretaceous chalk at Wetumpka impact structure, Alabama; post-impact sediment?. Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 40: 2381, 2009

Shallow-marine impact origin of the Wetumpka Structure (Alabama, USA). Earth and Planetary Science Letters 202(3-4): 541-549, 2002

Evidence of meteoritic impact, crater-filling stratigraphy, and collateral effects of impact at Wetumpka Crater, Alabama, USA. Abstracts with Programs - Geological Society of America 31(7): 124, 1999

Wetumpka impact structure, Alabama. Abstracts with Programs - Geological Society of America 39(2): 97, 2007

The Wetumpka asteroid impact structure in Alabama, U.S.A. Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists 1998, 1998

Wetumpka impact structure Alabama; a gravity model. Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 42: 2732, 2011

Wetumpka impact structure Alabama; gravity survey. Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 40: 1218, 2009