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Note added at 28 mins (2015-08-30 15:56:57 GMT)
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A review of habitats with Recent serpulid mass-occurrences allows interpretation of the palaeoenvironment in which the serpulid limestones in the

http://www.researchgate.net/publication/279761860_A_review_o...
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Serpulidae is a family of sessile, tube-building annelid worms in the class Polychaeta.
actuopalaeontology and the 'Upper Malm' serpulid limestones in NW Germany
https://en.wikipedia.org/wiki/Serpulidae
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Acta Palaeontologica Polonica
These tubular fossils have been traditionally referred to as serpulids, but here we identify them as microconchids

Palma, R.M. and Angeleri, M.P. 1992. Early Cretaceous serpulid limestones: Chachao Formation, Neuquen Basin, Argentina. Facies 27: 175–178.

http://www.bioone.org/doi/abs/10.4202/app.2010.0086