Computer Code: |
HACR |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Callovian Age (JC)
— Callovian Age (JC) |
Lithological Description: |
Comprises up to 2 m of grey marl and siltstone and sandstone passing up to pale bluish grey limestone (weathering pale brown) with beds of berthierine (chamosite)-rich ooids, commonly bioturbated with small horizontal and vertical burrows; ammonites including Kosmoceras spinosum, Quenstedtoceras spp. and Reineckeia (Collotia) sp. indicate an age ranging from latest Athleta Zone to Lamberti Zone (Wright, 1968b, 1978). |
Definition of Lower Boundary: |
none recorded or not applicable
|
Definition of Upper Boundary: |
none recorded or not applicable
|
Thickness: |
Up to 2 m. |
Geographical Limits: |
none recorded or not applicable
|
Parent Unit: |
Osgodby Formation (OSBY)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Barron, A J M, Lott, G K, and Riding, J B. 2012. Stratigraphical framework for the Middle Jurassic strata of Great Britain and the adjoining continental shelf. British Geological Survey Research Report RR/11/06. |
Wright, J.K. 1968b. The Callovian succession at Peckondale Hill, Malton, Yorkshire. Proceedings of the Yorkshire Geological Society, 37, 93-97. |
Wright, J.K. 1978. The Callovian succession (excluding Cornbrash) in the western and northern parts of the Yorkshire Basin. Proceedings of the Geologists' Association, 89, 259-261. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |