SILURIAN AND DEVONIAN CLATHRODICTYIDS AND OTHER STROMATOPOROIDS FROM THE BROKEN-RIVER REGION, NORTH QUEENSLAND

Stromatoporoids are well represented in the carbonate depositional pha ses of the Middle-Upper Silurian Jack Formation, the Lower-Middle Devo nian Shield Creek Formation and Broken River Group of north Queensland . A total of 4 species of Labechiida, 4 species of Actinostromida, 14 species (4 new) of Clathrodictyida and 5 species (1 new) of Stromatopo rellida are described and illustrated. They include the new species Ge rronostroma doseyense, G.? apertum, Schistodictyon jackense, Atelodict yon repandum and Hermatostroma malletti. The fauna comprises represent atives of Cystostroma, Labechiella, Stylostroma, Actinostroma, Aculato stroma, Ecclimadictyon, Plexodictyon, Anostylostroma?, Nexililamina, P seudoactinodictyon, Tienodictyon, Simplexodictyon, Stromatopororella, Stictostroma, Trupetostroma?, Amnestostroma and Stachyodes. Included a re revisions of a number of C.W. Mallett's species first described in the early 1970s. The genus Nexililamina Mallett is reinterpreted as a clathrodictyid. The history of the 'less advanced' labechiids suggests they came close to extinction in the Early Devonian. However, they su rvived as a distinctive, relict stock in the Lower Devonian Broken Riv er assemblages (up to 4 genera recorded), and lived in close associati on with non-labechiid components of the fauna.