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第 6 卷 第 1 期
古 生 物 学 文 摘 ( 网 络 版 )
2010 年 3 月
古 生 物 学
综 论
2010010001
回 复 : 碳 酸 盐 岩 中 记 录 的 后 生 动 物 支
系 早 新 元 古 代 起 源 的 证 据 = Early
Neoproterozoic origin of the metazoan
clade recorded in carbonate rock texture:
REPLY. ( 英 文 ). Neuweiler F; Turner E
C; Burdige D J. Geology, 2009, 37(9):
E196-E196
2010010002
安 第 斯 中 部 晚 中 新 世 海 侵 高 潮 的 同 位
素 、 古 生 物 和 遗 迹 学 证 据 = Isotopic,
paleontologic, and ichnologic evidence
for late Miocene pulses of marine incursions
in the central Andes. ( 英 文 ). Uba
C E; Hasler C A; Buatois L A; Schmitt
A K; Plessen B. Geology, 2009, 37(9):
827-830
Recognition of an inferred Miocene
marine incursion affecting areas from
Colombia through Peru and Bolivia and
into Argentina is essential to delineate
the South American Seaway. In Bolivia,
corresponding strata of inferred marine
origin have been assigned to the late
Miocene Yecua Formation. We carried
out high-resolution delta C-13 and delta
O-18 isotopic studies on 135 in situ carbonates
from 3 outcrops, combined with
detailed sedimentologic, paleontologic,
and ichnologic analysis. Four less negative
delta C-13 excursion levels were
recorded that coincide well with beds
containing marine body (barnacle) and
trace (Ophiomorpha) fossils. These
strata are interbedded with red-green
beds containing mudcracks, plant roots,
gypsum, and trace fossils of the continental
Scoyenia ichnofacies. Our data
are significant in that they show for the
first time four possible short-lived marine
incursions in the Bolivian central
Andes during the late Miocene. The result
is constrained by a new U-Pb date
of 7.17 +/- 0.34 Ma at the top of Yecua
strata.
2010010003
两 侧 对 称 动 物 的 崛 起 = The rise of bilaterians.
( 英 文 ). Freeman G. Historical
Biology, 2009, 21(1 & 2): 99-114
Recently Shen et al. have argued that
the Ediacaran faunas from Avalon-
Charnwood [580-560 million years ago
(MA)], the White Sea-Flinders Range
(560-550 MA) and Namibia (550-
543 MA) occupied the same morphospace
even though these faunas differed
in species composition, ecology, biogeography
and age. The traits they used
to characterise these faunas could not
distinguish between important promorphological
features such as radial vs. bilaterian
and unitary vs. colonial animals.
Their inappropriate assignment of symmetry
properties led to the homogenisation
of morphospace in these different
faunas. Another way to examine shifts in
morphospace involves sorting out radial
vs. bilaterian and unitary vs. colonial
genera in terms of their time of first appearance
in the fossil record. While genera
with both kinds of symmetry properties
and unitary and colonial animals
were present during the early Ediacaran,
there was a large proportional increase
in new bilaterian genera and a decrease
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