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North American Middle Cambrian

A very enjoyable recent reference work is: Robison et al. 2015. EXCEPTIONAL CAMBRIAN FOSSILS FROM UTAH: A WINDOW INTO THE AGE OF TRILOBITES.
Zacanthoides liddelli, 25 mm with full set of spines, Spence Shale, Utah Pagetia sp., 3.5 mm eodiscid, Spence Formation, Utah, USA Amecephalus laticaudum, 48 mm, Langston Formation, Box Elder County, Middle Cambrian, Utah, USA. Spencia typicalis, 11 mm, Spence Shale, 155' level, Miner's Hollow, Box Elder County, Utah Altiocculus drumensis, 54 mm, Middle Cambrian, Pierson Cove/Marjum Formation, Drum Mountains, Millard County, Utah.
Modocia typicalis, 36 mm trilobite. Marjum Formation, Millard County, Utah. Asaphiscus, Bolaspidella, Altiocculus, Elrathia, Millard County, Utah. Tricrepicephalus texanus, 55 mm. Weeks Formation, Millard County, Utah. Menomonia sahratiani sp, 17 mm Weeks Formation, Middle Cambrian. Millard County, Utah. Densonella sp., 16 mm Weeks Formation, Middle Cambrian. Millard County, Utah.
Coosella kieri, Cedaria minor and Genevievella granulata, Upper Weeks Formation, House Rang, Millar Country, Utah Naraoia, Marjum Formation, adjusted image Naraoia, 2 cm showing alimentary canal, digestive diverticula and faint traces of limbs, Marjum Formation, Middle Cambrian, Utah Aglaspidid? 20 mm complete in ventral view, with limbs and antennae (to 3 mm long). Weeks Formation, Millard County, Utah, USA. Beckwithia typa, 3 cm complete. Weeks Formation, Upper Middle Cambrian, Millard County, Utah, USA.
Fine 8 mm bivalved arthropod, Anabarochilina australis (Hinz-Schallreuter), Middle-Upper Cambrian Marjum Formation, Millard Co. Pseudarctolepis sharpi 6 cm. Wheeler Shale, Middle Cambrian, Millard County, Utah. Slab with three Choia sponges and an 8 cm long Portalia mira. Wheeler Shale, Middle Cambrian, Millard County. Leptomitus belilineata 155 mm protomonaxonid demosponge. Marjum Formation, Millard County, Utah. Leptomitus detail
Group of Crumillospongia purse sponges, the largest is 25 mm. Wheeler Formation, Millard Co, Utah. Diagoniella.jpg Chancelloria sp (7 rayed spicules predominate), Upper Wheeler Formation, Drumian, Middle Cambrian, Millard County, Utah. Dakorhachis thambus Priapulid worm, Ottoia prolifica, 12 cm around curve. Weeks Formation. Utah, USA.
Selkirkia willoughbyi, soft body preserved priapulid worm showing proboscis, 30 mm long. Marjum Formation, Utah. Archaeocothurnus bifida,13 mm, upper Wheeler Formation, House Range, Utah. Rare Middle Cambrian stylophoran. 32 mm Chancelloria eros with juvenile solutans (Coleicarpus sprinklei) attached. Coleicarpus sprinklei, a 45 mm solutan. Marpolia spissa, 25 mm, Spence Shale Member of the Langston Formation, Utah
Margaretia dorus. Marine alga, 140 mm. Wheeler Formation, Middle Cambrian. House Range, Millard County, Utah, USA. Sold as Thaumaptilon, but probably something new, 44 mm, Spence Shale, Middle Cambrian, Utah Anomalocaridid oral cone, 13 mm, Spence Shale, Miners Hollow Hurdia, pair of frontal appendages, 2 cm. Spence Shale. Banffia episoma of Conway Morris et al. 2015, 85 mm long, Spence Shale Member, Langston Formation (Cambrian Series 3, Stage 5)

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