Ed Medley

a melange; flotsam of memorabilia in a matrix of scribbles and snapshots

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bimrocks

Franciscan melange in Headland at McKerricher State Park nr Fort Bragg Mendocino Co (E Medley)

Stopped by because you are looking for information on bimrocks? Then go to my bimrocks website for the current collection of resources on bimrocks for geological and geotechnical practitioners.

What are bimrocks? Bimrocks are block-in-matrix rocks, mixtures of stronger blocks of rock surrounded by weaker matrix rocks. Bimsoils are analogous, being blocks within a soil matrix. Bimrocks and bimsoils are geologically, spatially, and mechanically heterogeneous. Bimrocks include melanges, fault rocks, weathered rocks, lahars and some “rock/soil mixtures.”

So What? Who cares? Bimrocks are troublesome to geotechnical engineers, geologists, contractors and owners by frustrating the economic and accurate characterization, design and construction of civil engineering works.

 Isn’t bimrocks a silly word? No.  It is a serious geological engineering term.  I coined the geologically neutral word bimrocks in 1992 to focus engineers’ attentions on the fundamental and troublesome fabric of strong rock blocks in weak rock matrix, regardless of geological origins and euphonious geological names. Geology is important, but engineers generally do not understand the rich language of geology and are confused by (and even dismissive of) geological words.

Are bimrocks rare? No, they are very common. I live and work near San Francisco, which hosts the Franciscan Complex (“the Franciscan” for short), a regional-scale jumble of shards of earth’s crust, interspersed with some of the most spectacular melanges and bimrocks in the world. I have written some on such rocks, but others write far more: there are thousands of papers on melanges, a good proportion focused on those of the Franciscan.  If you are interested in San Francisco area bimrocks, then look at this 2018 Field Trip Guide. 

For some overall guidance to bimrocks see the Introduction and Summary Lectures for the Short Course I taught in 2017 at Medellín, Colombia (Lecture PDFs can be downloaded); or, the annotated  but clunky-looking  “Introduction to Bimrocks”, Also useful may be the 2011 paper: Geopractitioner Approaches to Working With Anti-Social Melanges, a chapter in the book Special Paper 480: Mélanges: Processes of Formation and Societal Significance, by John Wakabayashi and Yildirim Dilek, published by the Geological Society of America.

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