There are many geology websites mentioning "bands of flint" as well as nodules of flint. Here are some samples:

http://www.naturalengland.org.uk/ourwork/conservation/geodiv...
A major phase of land subsidence marked the beginning of the Upper Cretaceous, leading to deposition of the Chalk. The chalk is a white pure limestone. It contains thin beds of marl and nodules of flint, either scattered or in bands.

Sedimentary basins and petroleum geology of the Middle East - Google Books Result
A. S. Alsharhan, A. E. M. Nairn - 1997 - Nature - 942 pages
Surface Formations The differences between the outcrop geology of the ... 10 m (33 ft) of chalky limestone with nodules and bands of black flint Unit 4: 108 ...
books.google.com/books?isbn=0444824650...

http://www.teara.govt.nz/en/gemstones/2
Chert, flint and jasper are opaque forms of silica that are usually formed as bands or nodules in sedimentary rocks


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Note added at 30 mins (2010-11-04 11:58:36 GMT)
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Or, simply "flint bands" as in the below:

The geology of England and Wales - Google Books Result
P. J. Brenchley, Peter Franklin Rawson - 2006 - Science - 559 pages
Some of these horizons extend for considerable distances and hence, like the marl layers, flint bands are of considerable value in correlation. ...
books.google.com/books?isbn=1862392005...


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Note added at 36 mins (2010-11-04 12:04:25 GMT)
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I'd forgotten to mention that I originally arrived at "bands" through the definitions of "liste" as: band, stripe, streak, line [Source: Cassell's Italian Dictionary]