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the basal Hettangian Tibeticum, the lower<br />
Hettangian Calliphyllum, and the middle Hettangian<br />
Pleuronotum zones. It is the only<br />
known succession across the Triassic/Jurassic<br />
boundary in the Tethyan Realm that is not<br />
condensed. The Marshi and Calliphyllum<br />
zones are correlated with the same zones in<br />
the Northern Calcareous Alps. The Tibeticum<br />
Zone, a new local zone, is transitional between<br />
the Marshi and the Calliphyllum zones in that<br />
it yields both choristoceratids and psiloceratids.<br />
Its base is taken to mark the base of the<br />
Jurassic System in the eastern Tethys.<br />
2008010192<br />
英 格 兰 中 侏 罗 世 巴 通 期 一 牡 蛎 生 长 速 率 和<br />
形 态 的 变 化 及 其 环 境 指 示 意 义 = Variation<br />
in growth-rate and form of a Bathonian (Middle<br />
Jurassic) oyster in England, and its environmental<br />
implications. ( 英 文 ). Johnson A;<br />
Liquorish M N; Sha Jingeng. Palaeontology,<br />
2007, 50(5): 1155-1173<br />
We review controls on extensional growth<br />
rate and shell thickness in the extant oyster<br />
Crassostrea. Data on these shell parameters<br />
for the ecologically similar Bathonian oyster<br />
Praeexogyra hebridica, sampled at carefully<br />
selected sites, are then used to test a hypothesis<br />
that small size in contemporaneous marine<br />
bivalves of north-west Europe was the product<br />
of reduced salinity. The hypothesis is refuted,<br />
at least to the extent that some additional factor<br />
must be involved. The relatively low extensional<br />
growth rate and shell thickness at the<br />
highest-salinity site, together with the elongate<br />
(‘etiolated’) shape there and the low extensional<br />
growth rate at all sites in comparison<br />
with Crassostrea, suggests that this factor is<br />
reduced primary productivity. Other faunal,<br />
sedimentological and diagenetic evidence is<br />
consistent with low productivity. We point to<br />
other possible instances of reduced productivity<br />
during the Middle Jurassic and discuss the<br />
possible role of this factor in encouraging the<br />
widespread colonization of brackish-water<br />
environments by bivalves in the Bathonian<br />
Stage.<br />
2008010193<br />
软 舌 螺 侧 面 刺 状 突 起 helens 的 骨 骼 显 微 结<br />
构 = Skeletal microstructure of helens, lateral<br />
spines of hyolithids. ( 英 文 ). Mus M M;<br />
Bergström J. Palaeontology, 2007, 50(5):<br />
1231-1243<br />
In hyolithids the skeleton consists of four<br />
elements: a conch, an operculum and a pair of<br />
long, logarithmically curved ‘spines’ called<br />
helens. These last elements are rarely preserved,<br />
and have therefore remained poorly<br />
known and enigmatic. We have studied threedimensionally<br />
preserved helens of the species<br />
‘Hyolithes’ lanceolatus, from the Permian of<br />
New South Wales, Australia, and ‘Hyolithes’<br />
groenwalli, from the Cambrian of Bornholm,<br />
Denmark. Helens were massive calcareous<br />
elements. Their original microstructure, herein<br />
reported for the first time, consisted of concentric<br />
lamellae surrounding a narrow elongated<br />
core, which may have been rich in organic<br />
matter. This concentric pattern resulted<br />
from the successive accretion of shell material<br />
at the proximal, internal portion of helens.<br />
This growth model is in accordance with helen<br />
morphology and with the presence of a characteristic<br />
surface sculpture of overlapping lamellae.<br />
2008010194<br />
福 建 深 沪 湾 晚 更 新 世 古 牡 蛎 滩 的 发 育 与 留<br />
存 古 环 境 = The distribution and age feature<br />
of Late Pleistocene palaeo-oyster shell beach<br />
and the palaeo-environment of the oyster<br />
shells remained in Shenhuwan bay, Fujian<br />
Province. ( 中 文 ). 徐 起 浩 . 海 洋 科 学 , 2002,<br />
26(4): 58-62<br />
福 建 深 沪 湾 晚 更 新 世 古 牡 蛎 以 牡 蛎 原<br />
生 、 分 布 原 积 大 , 年 龄 主 要 在 25 800±2<br />
490aB.P~15 460±420 aB.P 之 间 为 其 主 要 特<br />
征 , 在 牡 蛎 生 长 期 间 , 深 沪 湾 地 壳 抬 升 速<br />
率 与 水 动 型 海 平 面 上 升 速 率 相 当 , 深 沪 湾<br />
海 水 深 度 稳 度 , 海 岸 环 境 稳 定 , 古 牡 蛎 繁<br />
盛 生 长 , 其 后 深 沪 湾 地 壳 抬 升 成 陆 , 古 牡<br />
蛎 滩 脱 离 海 水 成 为 牡 蛎 滩 台 地 , 距 今 7<br />
000a 和 距 今 2 000a 的 两 次 强 古 地 震 , 使 古<br />
牡 蛎 滩 速 下 沉 到 潮 下 带 和 潮 间 带 海 底 , 这<br />
是 深 沪 湾 晚 更 新 世 古 牡 蛎 滩 能 留 存 到 今 天<br />
的 重 要 原 因 。<br />
2008010195<br />
印 度 库 奇 中 侏 罗 世 巴 通 期 新 的 菊 石 组 合 =<br />
New Bathonian (Middle Jurassic) ammonite<br />
assemblages from Kutch, India. ( 英 文 ). Roy P;<br />
Bardhan S; Mitra A; Jana S K. Journal of<br />
Asian Earth Sciences, 2007, 30(5-6): 629-651<br />
The Bathonian ammonite assemblages have<br />
been previously poorly recorded in Kutch. The<br />
present study has unearthed a rich array of<br />
ammonite taxa ranging from the Middle to<br />
Upper Bathonian. While Oxycerites Rollier<br />
(1909) is a new record from Kutch, the oldest<br />
occurrence of Choffatia Siemiradzki (1898)<br />
has been found from the Middle Bathonian<br />
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