02609nas a2200241 4500008004100000245017800041210006900219300001200288490000800300520179300308653002502101653001302126653002802139653001502167653001502182653001202197653002402209653001802233653002602251100001602277700002302293856005102316 2010 eng d00aFirst Evidence for Cambrian Glaciation Provided by Sections in Avalonian New Brunswick and Ireland--Additional Data for Avalon-Gondwana Separation by the Earliest Palaeozoic0 aFirst Evidence for Cambrian Glaciation Provided by Sections in A a174-1850 v2853 a
The first evidence for Cambrian glaciation is provided by two successions on the Avalon microcontinent. The middle lowest Cambrian (middle Terreneuvian Series and Fortunian Stage–Stage 2 boundary interval) has an incised sequence boundary overlain by a fluvial lowstand facies and higher, olive green, marine mudstone on Hanford Brook, southern New Brunswick. This succession in the lower Mystery Lake Member of the Chapel Island Formation may be related to melting of an ice sheet in Avalon. The evidence for this interpretation is a muddy diamictite with outsized (up to 10 cm in diameter), Proterozoic marble and basalt clasts that penetrated overlying laminae in the marine mudstone. That eustatic rise was associated with the mudstone deposition is suggested by an approximately coeval rise that deposited sediments with Watsonella crosbyi Zone fossils 650 km away in Avalonian eastern Newfoundland. A sea-level rise within the Watsonella crosbyi Chron, at ca. 535 Ma, may correspond to a unnamed negative 13C excursion younger than the basal Cambrian excursion (BACE) and the ZHUCE excursion in Stage 2 of the upper Terreneuvian Series. Cambrian dropstones are now also recognized on the northern (Gander) margin of Avalon in continental slope–rise sedimentary rocks in southeast Ireland. Although their age (Early–Middle Cambrian) is poorly constrained, dropstones in the Booley Bay Formation provide additional evidence for Cambrian glaciation on the Avalon microcontinent. Besides providing the first evidence of Cambrian glaciation, these dropstone deposits emphasize that Avalon was not part of or even latitudinally close to the terminal Ediacaran–Cambrian, tropical carbonate platform successions of West Gondwana.
10aBooley Bay Formation10aCambrian10aChapel Island Formation10aDiamictite10aGlaciation10aIreland10aMystery Lake Member10aNew Brunswick10asequence stratigraphy1 aLanding, E.1 aMacGabhann, B., A. uhttp://dx.doi.org/10.1016/j.palaeo.2009.11.00901068nas a2200181 4500008004100000245005200041210005100093300001100144490000700155520057500162653001700737653001600754653001500770653001600785653001200801100001800813856005500831 2010 eng d00aThree 19th-Century House Sites in Rural Ireland0 aThree 19thCentury House Sites in Rural Ireland a81-1040 v443 aThis report describes archaeological research at three house sites in rural Ireland. The anthropologically-based research began in 1994 with the goal of attempting to understand the material conditions of daily life in the 19th-century Irish countryside. The excavation results presented here were obtained from individual households in counties Roscommon, Sligo and Donegal, at sites dating from the early to mid-19th century. Two of the sites are known to have been abandoned as a result of forced eviction. Particular attention is paid to the ceramics found.
10a19th-century10aArchaeology10adaily life10ahouse sites10aIreland1 aOrser, C., E. uhttp://dx.doi.org/10.1179/174581310X12662382629175