A new ammonite and coccolith fauna from the lowermost Fernie Formation (Hettangian) in northwestern Alberta, Canada
A new ammonite and coccolith fauna from the lowermost Fernie Formation (Hettangian) in northwestern Alberta, Canada
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加拿大艾伯塔省西北部弗尼组（Hettangian）最低层的菊石和颗石动物群
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
J. Craig
中科院分区：
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作者：
R. Hall;D. R. Kendall;David G. Taylor;J. Craig
在阿尔伯塔省西北部地下最下层弗尼组深色沥青页岩底部上方25 cm处的岩心中，发现了菊石Discamphiceras cf. silberlingi Guex，确定了其中晚期的河东期。相关的球粒岩表明可能存在于河塘晚期至西奈木利亚早期，这是迄今为止这些页岩最古老的年龄，与露头带Nordegg组的西奈木利亚年龄和假定的盆地等效的Pliensbachian年龄（最近一些作者称之为“Nordegg组”）都有很大的不同。
The occurrence of the ammonite Discamphiceras cf. silberlingi Guex in a core 25 cm above the base of dark, bituminous shales of the lowermost Fernie Formation in the subsurface of northwestern Alberta establishes their middle to late Hettangian age. Associated coccoliths suggest a possible late Hettangian to early Sinemurian age, which is the oldest so far assigned to these shales and differs considerably from both the Sinemurian age of the type Nordegg Member of the outcrop belt and the Pliensbachian age of its supposed basinal equivalents ("Nordegg Member" of some recent authors).