Untitled

amps. The studied succession consists
of a stack of six cycles, consisting of terrigenous
mudstones passing upwards
into biocalcarenite wedges with distinct
clinoforms. The prograding biocalcarenite
bodies show seaward-increasing
height and steepness of the clinoformed
front as a result of development into increasingly
deeper water, and may be regarded
as the record of distally steepened
ramps, dominated by storminduced
downwelling flows. Evidence of
forced-regressive progradation is provided
by stratal geometries, physical
structures, and trace fossil assemblages
existing at the top of the bodies, which
attest to a gradual increase in energy
level at the top of the ramp, concurrently
with the progression of seaward outbuilding
of the bodies. Three trace-fossil
suites (Thalassinoides / Piscichnus,
Scolicia, Dactyloidites) are shown to be
linked with the successive growth stages
of individual prograding wedges,
whereas abandonment stages, characterized
by starvation of sediment input, are
marked by the Ophiomorpha suite. The
Capodarso ramps, like other Plio-
Pleistocene equivalents of the Mediterranean
area, are small, high-gradient
ramps, with stratigraphical architecture
controlled by high-amplitude, orbitally
driven glacio-eustatic changes. An ecologically
and bathymetrically based subdivision
of the ramps into inner, mid and
outer ramp environments is hardly applicable,
as most of the wedge progradation
occurs in highly dynamic conditions,
dominated by physical processes of
transport and resedimentation of skeletal
material, which result in faunal composition
dominated by allochthonous material.
The use of trace fossils is of critical
value in this context, due to the scarcity
of ecological information provided by
faunal elements.
2010010025
重 新 评 价 晚 二 叠 世 一 巨 齿 龙 遗 迹
Pachypes = A re-evaluation of
Pachypes, a pareiasaurian track from the
Late Permian. ( 英 文 ). Valentini M;
Nicosia U; Conti M A. Neues Jahrbuch
fur Geologie u. Palaontologie / Abhandlungen,
2009, 251(1): 71-94
The ichnotaxon Pachypes dolomiticus
Leonardi et al., 1975 from the Upper
Permian Arenaria di Val Gardena
(Northern Italy) was erected on the bosis
of an isolated pes and assigned to pareiasaurs.
Over the last three decades several
other footprints haqve been found,
including partial trackways, allowing
here to refine the P. dolomiticus features
and variability and to confirm the biotaxon
correlation with pareiasaurs. Recently,
two large reptilian ichnotaxa hve
been uncovered from the Upper Tatarian
of Russia.
2010010026
美 国 弗 吉 尼 亚 下 志 留 统 作 为 行 为 古 生
态 证 据 的 Atthrophycus alleghaniensis
的 集 群 和 形 态 变 异 = Clustering and
morphologic variation in Arthrophycus
alleghaniensis (Lower Silurian of Virginia,
USA) as evidence of behavioral
paleoecology. ( 英 文 ). Miller W III;
Webb F Jr; Raymond L A. Neues Jahrbuch
fur Geologie u. Palaontologie /
Abhandlungen, 2009, 251(1): 109-117
Based on depositional setting, the spatial
patterns of burrows and their
morpnhologie variations, the trace producer
was likely a powerful burrower
capable of penetrating a thick tidal sand
blanket, locating food-rich patches
within a buried mud layer, of mining
lthe patches (while simultaneouly avoiding
adjacent burrowers in manycases),
and backfilling its burrow system as it
either shifted position for more mining
activity or withdrew from the area. The
pattern does not necessarily record the
activities of hundreds of endobenthic
animals in a small space, but instead
could reflect a burst of activity by a
small population exploiting the food-
9