Hello all,
I collected some material from the Santa Monica mound structure this summer
with MBARI, it is amazing stuff, so many tubes! I have not identified the
tubes yet, but will be looking into their ultrastructure. It would be
really interesting to compare them with the Calaveras Reservoir material.
I've attached a picture of what these tubes look like, and they can indeed
be found in various states of fossilisation.
Best,
Maggie
PhD Student
School of Earth and Environment
University of Leeds
Leeds LS2 9JT
&
Life Sciences Department
Natural History Museum
London SW7 5BD
On 22 September 2014 18:47, Powell, Charles <cpowell from usgs.gov> wrote:
> 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/>> _______________________________________________
> Annelida mailing list
> Post: Annelida from net.bio.net> Help/archive: http://www.bio.net/biomail/listinfo/annelida> Resources: http://www.annelida.net>-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_1403.jpg
Type: image/jpeg
Size: 154958 bytes
Desc: not available
Url : http://www.bio.net/bionet/mm/annelida/attachments/20140923/a246011f/IMG_1403.jpg
