Group | Stage | Formation | Member |
---|---|---|---|
LIAS |
Cleveland Ironstone |
Kettleness |
|
Penny Nab |
The Cleveland Ironstone Formation is characterised by rhythmic sequences of dark argillaceous siltstone and silty sandstone capped by twelve relatively thin, but laterally persistent beds, of oodial ironstone. It is confined to the Cleveland Basin, and encompasses a large part of the Upper Pliensbachian Substage. The lower boundary of the Cleveland Ironstone Formation is gradational from the Staithes Sandstone Formation below, and the upper boundary is sharply defined by the incoming of dark mudstones at the base of the Whitby Mudstone Formation.
JNCC - Nature conservation adviser to UK Government
TENUICOSTATUM ZONE | IRONSTONE SEAMS | BEDDING | Fossil indicators | |
---|---|---|---|---|
WHITBY MUDSTONE |
||||
hawskerense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
------------------------------------ |
---------------------------- |
|
|
|
apyrenum |
|
Top Block |
|
|
|
|
|
||
Bottom Block | ||||
---------------------------- |
|
|
|
|
---------------------------- |
|
|
|
|
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
---------------------------- |
|
|
|
|
|
|
|
|
|
------------------------------------ |
---------------------------- |
|
Highest A. margaritatus |
|
gibbosus |
|
|||
---------------------------- |
|
|
|
|
o o o o o o o o |
|
|||
|
||||
silty shale |
||||
o o o o o o o o | ||||
shale |
||||
Lowest A. ferrugineum |
||||
o o o o o o o o | ||||
------------------------------------ |
---------------------------- |
|
|
|
subnodosus |
|
|||
|
||||
---------------------------- |
o o o o o o o o o o o |
|
|
|
o o o o o o o o |
Highest A. subnodosus |
|||
|
|
Shell bed |
||
|
silty shale |
|
|
|
|
|
Shell bed |
||
|
|
|
|
|
o o o o o o o o | ||||
shale |
||||
|
|
|
||
|
Lowest A. margaritatus |
|||
|
|
|
||
Lowest A. subnodosus |
||||
|
|
Abundant A. stokesi var. wertheri |
||
------------------------------------ |
|
|
||
stokesi |
Highest A. stokesi |
|||
|
|
|
||
|
|
|
|
|
|
|
|||
|
|
|
||
Highest A. stokesi var. wertheri |
||||
|
|
|
||
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
Lowest A. stokesi var. wertheri |
||
|
|
Shell bed & A. stokesi |
||
|
|
|||
|
sandstone |
|
|
|
|
|
|
|
|
|
A. stokesi RARE |
|||
|
||||
sandstone |
||||
o o o o o o o o | ||||
o o o o o o o o | ||||
Lowest A. stokesi |
||||
------------------------------------ |
|
|
|
|
figulinum |
o o o o o o o o | |||
|
|
|
|
|
STAITHES SANDSTONE |
sandstone |
Siderite concretion embedded in Jurassic silts of the Lower Lias at Staithes
Image by John Vincent dated: July, 2004