Denmark Hill Insect Bed | |
---|---|
Stratigraphic range: Carnian | |
Type | Geological formation |
Unit of | Blackstone Formation |
Underlies | Bluff coal seam |
Overlies | Aberdare coal seam |
Thickness | 15 cm (5.9 in) |
Lithology | |
Primary | Shale |
Location | |
Coordinates | 27°36′S152°48′E / 27.6°S 152.8°E |
Approximate paleocoordinates | 59°00′S105°48′E / 59.0°S 105.8°E |
Region | Ipswich |
Country | Australia |
Type section | |
Named for | Denmark Hill |
The Denmark Hill Insect Bed is a Triassic fossil locality in the Denmark Hill Conservation Park of Ipswich, Queensland, Australia. [1] [2]
It belongs to the Blackstone Formation (Ipswich Coal Measures Group) dated to the Carnian age (228.0 - 216.5 million years ago). Its coordinates are 27°36′S152°48′E / 27.6°S 152.8°E . Its paleogeographic coordinates are 59°00′S105°48′E / 59.0°S 105.8°E . [3]
The fossiliferous layer is located in between the Bluff coal seam and the Aberdare coal seam. It is 15 cm (5.9 in) thick and is composed greenish grey to brownish grey arenaceous shale. The existence of coal seams above and below the layer indicates that it may have once been a lake (lacustrine environment). [3]
The site is noted as a source of well-preserved insect fossils. [1] [4]
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The Blackstone Formation is a geologic formation of the Ipswich Coal Measures Group in southeastern Queensland, Australia, dating to the Carnian to Norian stages of the Late Triassic. The shales, siltstones, coal and tuffs were deposited in a lacustrine environment. The Blackstone Formation contains the Denmark Hill Insect Bed.
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The Tarjados Formation is an Early to Middle Triassic geologic formation in the Ischigualasto-Villa Unión Basin of La Rioja Province in northwestern Argentina. The red to whitish sandstones and conglomerates of the formation were deposited in an arid fluvial environment. The formation overlies the Talampaya Formation and is overlain by the Chañares Formation of the Agua de la Peña Group.
The Talampaya Formation is an Early Triassic (Olenekian) geologic formation in the Ischigualasto-Villa Unión Basin of La Rioja Province in northwestern Argentina. The pink to red sandstones of the formation represent the oldest sedimentary unit in the basin, overlying basement rock and were deposited in a high-energy braided river environment. Ichnofossils, probably left by an archosaur chirotherian, were found in the formation. The formation crops out in the Talampaya National Park, which was designated a UNESCO World Heritage Site in 2000.
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