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Day 146 : Tertiary bauxite from between basalt lava flows, Lyles Hill, near Belfast, Co. Antrim, Northern Ireland. 

Day 145 : Down in London at the Geological Society. Here is the rudist limestone in the gents bogs at Burlington House.

Day 144 : The Cenomanian Totternhoe Stone Member of the wonderfully named Zig Zag Chalk Formation. From Ivinghoe, Buckinghamshire, England. Keele collection.

Day 143 : Pleistocene Nene Terrace Gravels from Thrapston, Northamptonshire, England.  Keele collection.

Day 142 : The Lower Cretaceous, Lower Greensand, Folkestone Formation from Borough Green, Kent, England. Keele collection.

Day 141 : The Jurassic (Aalenian to Bathonian) Inferior Oolite from Painswick, Gloucestershire, England. Keele collection.

Day 140 : A flint from the Upper Chalk that has been jasperised by the overlying Antrim Basalts. From northwest of Lisburn, Northern Ireland. Keele collection.

Day 139 : And another rock I know by its old name, Keuper Sandstone, this is the Lower Triassic Helsby Sandstone Formation from Runcorn, Cheshire, England. Keele collection. 

Day 138 : Celestine (strontium sulphate) from the Mercia Mudstone (a.k.a. Keuper Marl), Yate, Gloucestershire, England. Keele collection.

Day 137 : Another classic British rock name that has been superseded. I know this as the Magnesian Limestone but it is now the Brotherton Formation of the Zechstein Group (Upper Permian). From Sherburn-in-Elmer, Yorkshire, England. Keele collection.