1,625 research outputs found
The biodiversity of the Wealden ghyll woodlands: species richness, abundance and distribution patterns in a rare and fragmented habitat
No full textTHE ECONOMICS OF FLOW ENHANCEMENT VS. NUTRIENT CONTROLS IN MEETING WATER QUALITY STANDARDS
No full textThis paper explores the economics of using enhanced flow as part of a strategy to meet water quality standards. We begin by briefly sketching the relevant economic theory, which we then apply to a case study of a dissolved oxygen impaired stream segment in Georgia's Flint River Basin. Results show that meeting targeted water quality standards with strategies that include enhanced flow is significantly less costly than relying only on agricultural management practices.Environmental Economics and Policy,
Burlingham (North), St. Andrew\u27s Parish Church, Norfolk, UK, tower
No full textTower from Burlingham (North), St. Andrew\u27s Parish Church.ote flint construction.https://digital.kenyon.edu/peregphotos/2582/thumbnail.jp
Upper Permian magnetic stratigraphy of the lower Beaufort Group, Karoo Basin
No full textWe carried out a magnetostratigraphic and geochronological study of late Permian sediments in the Karoo Basin of the Western Cape Province, South Africa. A continuous, ~700 m thick section of deltaic sediments of the upper Waterford Formation (uppermost Ecca Group) and the fluvial sediments of the Abrahamskraal Formation (lowermost Beaufort Group) were sampled at the meter scale. U-Pb dating of zircons from interbedded volcanic ash beds by ion microprobe (SHRIMP) provided absolute age constraints on the age of the sedimentary rocks. Paleomagnetic analysis reveals a partial overprint of the Natural Remanent Magnetization (NRM) that is tentatively ascribed to the emplacement of the Karoo Large Igneous Province in the Western Cape region during the middle Jurassic. A stable component of the NRM was found at temperatures higher than 450°C and was interpreted as a Characteristic Remanent Magnetization (ChRM) acquired during deposition, supported by a positive reversals test for this dual polarity ChRM. The virtual geomagnetic pole position for the Waterford and Abrahamskraal Formations computed from the average ChRM direction is in general agreement with the late Permian directions for stable Gondwana. A significantly different average inclination, and thus paleomagnetic pole position, is obtained by correcting the inclination shallowing error by the Elongation-Inclination method (Tauxe and Kent, 2004). The presence of both normal and reversed polarity zones indicate deposition after the end of the Kiaman Superchron, moreover the polarity sequence is in good agreement with the Illawarra sequence of Steiner (2006). Our results indicate a Capitanian (late Guadalupian) age for the Abrahamskraal Fm., in agreement with the Late Permian age, based on presence of Glossopteris flora and Dicynodont fauna, traditionally assigned to the fluvial- lacustrine sediments of the Beaufort Group. However, the U-Pb zircon ages of ca. 264-268 Ma suggest an age of 269 Ma for the top of the Kiaman superchron
Comparing the Formation and Characteristics of Use-Wear Traces on Flint, Chert, Dolerite and Quartz
No full textUse-wear traces are considered to be material specific. The use of an appropriate reference collection is thus fundamental for interpreting tools' function. To test whether a flint reference collection can be used to interpret the function of non-flint tools, I conducted experiments using chert, dolerite, and quartz endscrapers and flakes. I compared wear traces obtained during the experiment with use-wear on experimental flint tools exposed to the same variables (motion, contact material, time). The results highlighted strong similarities in the characteristics and distribution of traces on chert and flint. Dolerite and quartz differ from flint, especially regarding the distribution and appearance of use-polish. However, shared traits were observed in all the raw materials involved in this experiment, demonstrating a certain degree of comparability between use-wear traces on flint and non-flint rocks. Based on the data, a flint reference collection can allow a basic interpretation of use-wear also on different rocks.Team Joris Di
The early Neolithic flint mines of Sussex and their wider environs (4000-3650 BC)
No full textThe study of Early Neolithic flint mining began in the late 19th century in Sussex with a series of seminal excavations at chalk downland sites, including Blackpatch, Church Hill, Cissbury and Harrow Hill. Over the next century further excavations and research on the Sussex mines contributed to the narrative of the Neolithic period in southern England. The Early Neolithic flint mines of Sussex remain one of the earliest forms of large-scale monument to be constructed in the British Isles and their products, mostly finely made bifacial axes, were widely distributed across the region. Numerous flint mines are also found across Northwest Europe, including extensive complexes in Belgium, France, Poland and the Netherlands, and the act of extracting flint from deep workings remains a defining element of the Neolithic. Research on the English flint mines has diminished in recent decades, with no new fieldwork carried out for over 30 years, in contrast to Continental Europe where numerous sites are still under excavation. This thesis combines archival research and reassessment of previous research with new fieldwork, radiocarbon dates and other data to question longstanding interpretations of the Sussex mines. It is proposed that flint mines were pivotal monuments to the creation, development and spread of nascent Early Neolithic practices and cultural identities from the very start of the period in southern England. The thesis develops the study of flint mining beyond the immediate mine workings and into the wider landscape. Finally, this thesis increases knowledge on the communities who extracted flint from deep beneath the ground from the start of the Neolithic, one of the most important periods in the prehistory of the British Isles
Burlingham (North, St. Andrew\u27s Parish Church, Nofolk, UK, entrance to south porch
No full textEntrance to south porch, Burlingham (North), St. Andrew\u27s Parish Church, flint construction.https://digital.kenyon.edu/peregphotos/2583/thumbnail.jp
Phylloicus farri Flint
No full textPhylloicus farri Flint Figs. 4950 Phylloicus farri Flint, 1968b:56 [Type locality: Jamaica, St. Andrew, Hope River near Newcastle at mile post 16.5; NMNH; male; female, larva, pupa, case]. — Denning et al. 1983:188 [type species of Murielia]. — Flint et al. 1999b:73 [returned to Phylloicus]. Phylloicus farri is easily recognized by the very long (at least twice length of genital capsule, narrow preanal appendages (Fig. 49A, B). The modifications of male tergum IV are also distinctive (Fig. 49F). Adult. Forewing length 7.711.3 mm, n = 14. Head golden brown. Maxillary palps golden brown. Antenna twice forewing length; dark brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Dorsal pterothorax golden brown; ventrolateral thorax golden. Legs golden. Metathoracic leg of male without posterior fringe. Tibial spur formula 2,4,4. Forewing flat; golden brown; with single transverse band; proximal band tan, reaching posterior wing margin, at least 1/2 width of wing; proximal half of basal cells clear. Hind wing basal brush present in male, pale. Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures present. Tergum IV with expanded lateral flanges, mesal coremata and lateral coremata; lateral coremata with basal globose lobes and long tubular posterior lobe; mesal coremata singlelobed, singlelobed, originating broadly from membrane of tergum IVV. Tergum V without sclerotized modifications (Fig. 49F). Sternum VII with short, acute anteromesal process. Sternum VIII similar to anterior sterna, sternum IX not elongate. Tergum IX without mesal ridge; posterior margin not distinct from base of tergum X; notched anteromesally (Fig. 49B); lateral ridge absent; dorsal pleural setae approximately 6, ventral pleural setae absent (Fig. 49A); sternum IX with paired mesolateral ridges; sternum IX (Fig. 49C). Preanal appendage at least 11/2 times length of tergum X, of uniform diameter throughout length, setae long, but not filamentous or longer than appendage (Fig. 49A, B). Tergum X without basal lobes; basodorsal process absent; basolateral processes absent; apex, in lateral view, acute, in dorsal view, notched, notch triangular; with short setae basodorsally (Fig. 49A, B). Harpago slightly tapered; peglike setae tiny, mesal (Fig. 49A, C). Phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoeshaped (Fig. 49D, E). Female. Abdominal terga IIII dark brown laterally. Preterminal abdominal terga with anteromesal notch. Sternum VII with short pointed anteromesal process. Tergum VIII without posterolateral brush; sternum VIII cleft posteromesally to anterior ridge; sternum VIII (Fig. 50C). Tergum IX without mesal ridge (Fig. 50B). Sternum IX anterior lobes smooth and indistinct, posterior lobes striate, with shallow pockets anterolateral to vaginal opening (Fig. 50A). Tergum X appendage longer than mesal lobe, base indistinct, apex triangular; mesal lobe lightly sclerotized; digitate lateral processes absent (Fig. 50B). Sternum X with semisclerotized plates marking anal opening (Fig. 50A). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite rounded anteriorly, posterolateral projections acute; posterior sclerite triangular; posterior end of spermatheca a sclerotized ring (Fig. 50A). Material examined. JAMAICA: Saint Andrew Parish: Hardwar Gap Dicks Pond Tr., 16.vii.1963, Flint & Farr — 2 female paratypes (NMNH); Newcastle, stream at milepost 16.5, 30.vii.1962, Farr & Flint — holotype male, 1 female paratype (NMNH); 18.vii.1963, Flint & Farr — 1 female paratype (CNC); small stream, 11/ 8 mi. SW crossing Dick's Pond Trail, Hardwar Gap., 22.ix.1963, Peters & Farr — 1 male, 1 female paratypes (NMNH); 26.ix.1963, Peters & Farr — 1 male paratype (NMNH); Yallahs River, Chestervale, 17.vii.1963, Flint & Farr — 1 female paratype (NMNH); Saint Ann Parish: between Lake & Runaway Bay Cave, 6.xii.1975, D & M Davis — 2 males (UMSP); Mt. Diablo, 13.iii.1966, S & W Duckworth — 1 male, 2 female paratypes (UMSP). Distribution. Jamaica.Published as part of PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), pp. 1-214 in Zootaxa 275 (1) on pages 51-53, DOI: 10.11646/zootaxa.275.1.1, http://zenodo.org/record/501923
Burlingham, St. Andrew\u27s (North) Parish Church, Norfolk, UK, detail of tower
No full textBurlingham, St. Andrew\u27s (North) Parish Church, detail of tower.ote sound holes and small windows on staircase. Flint construction.https://digital.kenyon.edu/peregphotos/2581/thumbnail.jp
Neotrichia contrerasi Harris and Flint 2016, new species
No full textNeotrichia contrerasi Harris and Flint, new species Fig. 3 Neotrichia contrerasi is another member of the canixa group of Keth et al. (2015) with some similarity to N. tauricornus Malicky in the structure of the subgenital plate and the inferior appendages. It differs from N. tauricornis and other members of the canixa group in the combination of small, widely spaced horns of the tenth tergite, the evenly divided branches of the bracteoles, and the elongate ventral process of the subgenital plate. Male. Length 2.0 – 2.2 mm. 18 antennal segments, body brown in alcohol. Abdominal segment VIII annular. Segment IX incomplete dorsolaterally, posteriorly truncate with setal-bearing lobe on dorsum, anteriorly rounded; in ventral view deeply incised on posterior and anterior margins; dorsally fused with segment X. Tergite X wide, with broad incision posteriorly creating small lateral horns; in lateral view elongate, narrowing posteriorly to acute apex. Subgenital plate in lateral view narrowing distally to elongate process, which extends ventrad to tip of inferior appendages; in ventral view narrow over length, T-shaped apically with pair of elongate mesal setae. Bracteoles bifid, dorsal branch slightly longer than the ventral branch, each with long seta apically. Inferior appendages wide basally, tapering distally, ventral process about half length of appendage; in ventral view nearly extending to tip of subgenital plate, wide basally, tapering distally and curved mesad, mesal processes short and stout bearing apical seta. Phallus tubular, constricted at mid-length and bearing thin paramere encircling shaft, apex divided into pair of elongate processes, which are at an angle to the shaft, ejaculatory duct protruding distally. Type material. Holotype, male - Mexico, Nuevo Leon, Municipio de Santiago, Rio Ramos at Los Adjuntas, 4.5 km southeast Puerto Genovevo, N25 o 18’, W100 o 08’, 12 May 1989, S. Harris and A. Contrera s (NMNH). Paratypes - same as holotype, 4 males (INHS, NMNH), United States, Arizona, Coconino County, West Fork Oak Creek, A79-17, 9 August 1979, M. Sanderson, 1 male (INHS). Etymology. Named for Atilano Contreras-Ramos who collected the species with the senior author and has contributed much to our knowledge of the aquatic insects of Mexico.Published as part of Harris, Steven C. & Oliver S. Flint, Jr., 2016, New species of microcaddisflies (Trichoptera: Hydroptilidae) from the western United States, Canada, Mexico and Belize, pp. 1-22 in Insecta Mundi 2016 (499) on page 3, DOI: 10.5281/zenodo.517072
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