PANCHEN & WALKER, 1961
Locality: Swanwick Colliery, southern end of Yorkshire and East Midland coalfield, near Alfreton, Debyshire County, England.
Horizon:
Biostratigraphy: Communis zone.
Age: Westphalian A, Middle Silesian Series, Upper Bashkirian – Lower Moscovian Epoch, Middle Carboniferous (Middle Pennsylvanian).
Material:
Number: Not given:
Note: Probably Megalocephalus.
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/WATSON, 1926
Locality: Pirnie Colliery, near Leven, Fifeshire Province, England, southern United Kingdom.
Horizon: Earl David's Parrot Coal, Middle Coal Measures.
Biostratigraphy: Middle Modiolaris zone.
Age: Lower Westphalian B, Lower Upper Silesian series, Kashirskian Stage, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material:
Number: Not given: Incomplete skull.
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/WATSON, 1926, 1929
Locality: Coalbrookdale, Shrapshire County, England, southern United Kingdom.
Horizon: Modiolaris zone, Middle Coal Measures,
Biostratigraphy:
Age: Kashirskian Stage, Westphalian B, Lower Upper Silesian series, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material:
BMNH R555: Skull.
Locality: Black Shale, Low main seam at Newsham in Northumberland County, England, southern United Kingdom.
Horizon: Middle Coal Measure,
Biostratigraphy:
Age: Westphalian B, Lower Upper Silesian series, Kashirskian Stage, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material:
Numbers: Not given: 4 complete and 6 incomplete skulls.
.
Locality: Airdrie District, Strathclyde Province, Scotland, Northern United Kingdom.
Horizon: Palaceeraig Ironstone, Middle Coal Measures.
Biostratigraphy: Lower similus-pulchra zone.
Age: Westphalian B, Lower Upper Silesian series, Kashirskian Stage, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material:
Numbers: Not given:
Locality: Fenton, North Staffordshire County, England, southern United Kingdom.
Horizon:
Biostratigraphy: Lower Phillipsii zone.
Age: Westephalian C, Middle Silesian series, Podolskian stage, Moscovian Epoch, Middle Carboniferous (Middle Pennsylvanian).
Material:
Numbers: Not given: 1 or more skulls.
Locality: Fenton, North Staffordshire County, England, southern United Kingdom.
Horizon: Chalky Mine Ironstone, Upper Coal Measures.
Biostratigraphy:
Age: Westephalian C, Middle Silesian series, Podolskian stage, Moscovian Epoch, Middle Carboniferous (Middle Pennsylvanian).
Material:
Numbers: Not given: 6 skulls?
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PATON, 1975
Locality: Newsham, Northumberland County, England, southern United Kingdom.
Horizon: Middle Coal Measures, Low Main Coal Seam,
Biostratigraphy:
Age: Westphalian B, Lower Upper Silesian series, Kashirskian Stage, Lower Moscovian Epoch, Early Middle Pennsylvanian, (Late Carboniferous).
Material:
RSM 1973.58.3 (formerly 1888.33): Anterior part of a right lower jaw.
RSM : Upper Jaw.
Locality: Sauchie, near Alloa, Clackmannashire Province, Scotland, Northern United Kingdom.
Horizon: Coal Measures.
Biostratigraphy:
Age: Middle Carboniferous.
Material:
RSM: 1 tooth.
= Orthosaurus sp STEEN 1930R 2675
Locality: Linton locality (Coal mines originally owned by the Ohio Diamond Coal Company), NE corner Sect. 13, T9N, R2W, Linton near Wellsvile, west bank near mouth of Yellow Creek, Saline Township, Jefferson County, Ohio.
Horizon: Canneloid shale underlying Upper Freeport Coal, Allegheny Group.
Biostratigraphy:
Age: Upper Westphalian D, Lower Upper Silesian series, Myachkovskian stage, Upper Moscovian Epoch, Middle Pennsylvanian (Late Carboniferous).
Material: Fragment of the check of an Orthosaurid skull which cannot be distinguished from the English Specimens of Orthosaurus.