Thank you for this information Geoff. I was not aware of this new work in
Santa Monica Bay although I have worked on cold-seep deposits in that
area. If anyone is interested in reprints please send me a request
privately - cpowell from usgs.gov. Thanks.
Best,
Chuck
Hein, J.R., Normark, W.R., McIntyre, B.R., Lorenson, T.D., and Powell,
C.L., II., 2006. Methanogenic calcite, 13C-depleted bivalve shells, and
gas hydrate from a mud volcano offshore southern California: Geology, v.
34(2), p. 109-112.
Powell, C.L., II and Groves, L., 2008, Notes on the association of
Vesicomyids and *Lucinoma* (Mollusca: Bivalvia) in southern California:
modern and fossil. The Festivus, v. 40, no. 5, p. 61-68.
On Fri, Sep 19, 2014 at 8:24 PM, Geoff Read <Geoffrey.Read from niwa.co.nz>
wrote:
> Hi all,
>> Here is a recent report I recall from a year ago of large sub-fossil worm
> reefs 650 m deep off Santa Monica, that may or may not be of interest.
> Perhaps someone has identified the worm tubes by now.
>> "... serpulid annelids. Many of the tubes were encased in soft mudstones
> of unknown age and were partially fossilized."
>>http://www.mbari.org/expeditions/Southern13/Leg2/Logbook/day4.htm>> Geoff
>>> Dr Geoff Read Marine Biologist
> +64-4-386-0321 | +64-21-209-1748 | 301 Evans Bay Parade, Greta Point,
> Wellington | www.niwa.co.nz [image: NIWA] <http://www.niwa.co.nz>
> -----Original Message-----
> From: annelida-bounces from oat.bio.indiana.edu [mailto:
>annelida-bounces from oat.bio.indiana.edu] On Behalf Of Powell, Charles
> Sent: Saturday, 20 September 2014 6:24 a.m.
> To: annelida from magpie.bio.indiana.edu> Subject: Re: [Annelida] worm tubes
>> Thank you for adding me Larry. I can fill in some of the details of the
> locality, age and environment of the rocks. The worm tube colonies are
> being collected from rocks mapped as the "Temblor" Formation. Temblor is
> in quote because it does not directly correlate with the type Temblor
> Formation in the Temblor Range in southern San Luis Obispo County, probably
> 200 miles away. This is a common problem in California geology. The rocks
> are well bioturbated mostly medium- to fine-grain sandstone with occasional
> well rounded pebble conglomerate beds. A normal marine fauna including
> mollusks and a number of marine mammals has and is being been found at the
> site. The site is the expansion of the Calaveras Reservoir east of Fremont
> and south of Livermore in the San Francisco East Bay. A new dam is being
> constructed and at this point they are still digging out for the new dam
> and exposing lots of faulting and apparently a thin section of marine
> "Temblor" Formation. Using sedimentology and the mollusks I believe the
> environment is outer shelf, possibly upper slope, possibly in a large same
> - think similar to Monterey Bay today, but between 20 and 15 million years
> ago. In fact I was talking with a vertebrate paleontologists last night
> who has looked and some of the vertebrates and between us we think the
> rocks are between 19.5 and 16 Ma. The colonies appear to have been
> transported as all of them I saw were lying on their side if you consider
> the rounded portion up. Jim Walker (the site paleontologists) and I are
> very excited about these worm colonies. If anyone has any questions please
> ask and I'll answer as best I can.
>> Best,
>> Chuck
>> On Fri, Sep 19, 2014 at 10:58 AM, Lovell, Larry <LLovell from lacsd.org> wrote:
>> > Alexei, Colin, Harry, and others,
> >
> >
> >
> > Thanks to all for the comments on these fossil worm tubes. I am adding
> > Chuck Powell to the email list so he can see any further relies on
> Annelida
> > to my post. He is the originator of the question and has more pics and
> > information he can share. Please make sure to include him in any further
> > discussion.
> >
> >
> >
> > Thanks,
> >
> >
> >
>>>>>
--
Charles L. Powell, II
U.S. Geological Survey, MS 975
345 Middlefield Road
Menlo Park, CA 94025
1-650-329-4985
https://profile.usgs.gov/cpowell/
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