Jim,
The comet field information you seek, I think, can be found in the article "An Exceptional Cosmic Influence..." by astrophysicist Victor Clube, published in Fred Hoyle's Universe, eds Wickramasinghe, Burbidge, Narlikar. As this is not an easy text to find even in major libraries, the thesis (a product of decades of work by Clube and Bill Napier) is essentially that the Taurid Complex results from the successive breakups of a massive comet, Proto-Encke. One of the orbital resonance periods of this material, Clube calculates, is 1470 years. He relates this causally to the Bond cycle: (quoting from the article) "the Earth will have experienced sequences of close encounters with dense regions of the meteor stream in the vicinity of the giant comet itself and in the vicinity of its resonant swarm of debris, respectively during one or other nodal intersection at regular intervals of 1/2P(omega) = 2520 years and successive approaches to the Earth's orbit by the libration centre at intervals in the region [long parametric equation not easy to type here] = 1470 years. The Earth will evidently undergo massive inputs of debris and dust at the frequencies of those intervals resulting in corresponding patterns of climatological change during the Upper Pleist. and Holocene" (cf. several Bond articles). The argument is persuasive. I have all relevant articles and references to the 1470 year cycle and related cometary cause.