Lowe J J, Lowe S
Quaternary Research Unit, Geography Department, City of London Polytechnic, Calcutta House, Old Castle Street, London El 7NT.
New Phytol. 1989 Nov;113(3):391-408. doi: 10.1111/j.1469-8137.1989.tb02417.x.
Pollen-stratigraphic information is presented for two profiles from a high resolution Devensian lateglacial succession at Llyn Gwernan, North Wales. Pollen concentration and preservation data are available for one of these profiles and two series of radiocarbon dates, one based on'conventional'radiometric counting and one on accelerator mass spectrometry measures, provide age estimates for the succession. The data indicate the following sequence of events at Llyn Gwernan: deglaciation of the area about or shortly before 14200 n. p.; cold, dry climatic conditions from 14200 to 13 200 n. p.; generally stable environmental conditions from 13 200 to 12 100 B.P.; steady deterioration of climate between 12100 and 11 160 B.I.; harsh climatic conditions between 11 160 and 10200-10000 B.P. This interpretation broadly supports that previously proposed for N. Wales on the basis of coleopteran evidence. Implications of some of the differences in pollen stratigraphy between the two Llyn Gwernan profiles and possible evidence for two minor climatic oscillations during the lateglacial interstadial are discussed.
本文展示了来自北威尔士Llyn Gwernan高分辨率德文期晚冰期演替的两个剖面的花粉地层学信息。其中一个剖面提供了花粉浓度和保存数据，两组放射性碳测年数据，一组基于“传统”放射性计数，另一组基于加速器质谱测量，为该演替提供了年龄估计。数据表明Llyn Gwernan地区发生了以下一系列事件：大约在公元前14200年或稍早之前该地区开始冰消作用；公元前14200年至13200年期间气候寒冷干燥；公元前13200年至12100年期间环境条件总体稳定；公元前12100年至11160年期间气候持续恶化；公元前11160年至10200 - 10000年期间气候恶劣。这一解释大致支持了之前基于鞘翅目证据对北威尔士提出的解释。文中讨论了Llyn Gwernan两个剖面之间花粉地层学的一些差异的影响，以及晚冰期间冰阶可能存在两次小气候振荡的证据。
