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or at different lithostratigraphic and/or
tectonic levels.
2010010564
大 型 脊 椎 动 物 在 雨 水 浸 湿 的 中 侏 罗 世
沙 丘 中 挖 出 的 洞 穴 = Burrows dug by
large vertebrates into rain-moistened
Middle Jurassic sand dunes. ( 英 文 ).
Loope D B. Journal of Geology, 2006,
114(6): 753-762
In south-central Utah, eolian crossstrata
of the Escalante Member of the
Entrada Sandstone contain inclined, cylindrical
burrows up to 63 cm in diameter
and 305 cm long. Of the 14 large
tunnels located during this study, 12 descend
from second- and third-order
bounding surfaces that formed on the lee
slopes of large dune ridges, well above
the water table. The tunnels are inclined
15 degrees-22 degrees; one tunnel ends
in an expanded chamber. Eolian crossstrata
fill proximal portions of four of
the tunnels and indicate that after abandonment,
sand drifts migrated as much
as a meter into the open shafts. Structureless
sand and breccia blocks that
were generated by roof collapse fill
other tunnels. Animals dug the tunnels
in rain-moistened, cohesive sand. The
burrows may have served as temporary
shelters from severe diurnal conditions
in the shadeless, subtropical Entrada
dune field.
2010010565
西 澳 大 利 亚 近 海 卡 那 封 盆 地 Tusk-1
和 Tusk-2 井 中 侏 罗 世 巴 柔 期 Athol 组
时 代 的 新 证 据 = New evidence for the
age of the Athol Formation (Middle Jurassic;
Bajocian) in the Tusk-1 and
Tusk-2 wells, offshore Carnarvon Basin,
Western Australia. ( 英 文 ). Riding J B;
Westermann G E G; Darbyshire D P F.
Alcheringa, 2010, 34(1): 21 - 35
The co-occurrence of ammonites with
palynomorphs in the Athol Formation of
the Tusk-1 and Tusk-2 wells drilled in
the offshore Carnarvon Basin, Western
Australia confirms the Early Bajocian
(Middle Jurassic) age of the Dissiliodinium
caddaense dinoflagellate cyst Oppel
Zone. The macrofaunas refine this Early
Bajocian age to the early Laeviuscula
Chronozone. A belemnite from the
Tusk-1 well has a strontium isotope
( 87 Sr/ 86 Sr) ratio consistent with the biostratigraphical
age. All the identifiable
ammonites belong to Pseudotoites robiginosus
(Crick). Pseudotoites is
prominent in the Early Bajocian of the
Indo-Pacific Realm, being known
mainly from onshore Western Australia
and the Southern Andes, together with
rare occurrences in Irian Jaya (west New
Guinea); somewhat surprisingly, it is
also rarely present in southern Alaska.
The palynofloras studied from the Tusk-
1 and Tusk-2 wells contain abundant
specimens of the marine dinoflagellate
cyst Dissiliodinium caddaense, and are
assigned to the Dissiliodinium caddaense
Oppel Zone. The Athol Formation
is a correlative of the Newmarracarra
Limestone of the onshore Perth
Basin, Western Australia; the distribution
of both these units indicates a marine
transgression onto the Australian
block during the Early Bajocian.
2010010566
摩 洛 哥 西 南 部 塔 法 牙 盆 地 赛 诺 曼 期 层
序 地 层 和 海 平 面 升 降 = Cenomanian
sequence stratigraphy and sea-level fluctuations
in the Tarfaya Basin (SW Morocco).
( 英 文 ). Kuhnt W; Holbourn A;
Gale A; Chellai El H; Kennedy W J.
Geological Society of America Bulletin,
2009, 121(11-12): 1695-1710
We investigated the sequence architecture
of two expanded Cenomanian
successions along a depth transect in the
Tarfaya Basin (SW Morocco) and correlated
these successions to published records
from northwest Europe and India.
Changes in terrigenous material, carbonate
and organic carbon content, carbonate
microfacies and foraminiferal biofacies,
as well as nondepositional and ero-
175