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Geologic Division --- Coastal and Marine Geology --- Woods Hole Field Center


Is there a relationship between cyst observations and geologic conditions?

In an effort to improve the cyst map used by Charlie Stock as the source term in the model, I've overlaid the cyst observations on top of some geologic maps developed here at the USGS.

Unfortunately, Polly Hastings (my mapping guru) and I couldn't figure out any way to do a statistical analysis of cell counts versus geologic type because MapInfo uses polygons instead of a grid.  Also, check with me or Polly if you want more info on the extent of the maps or the metadata.

Some interpretations:

1.  The NaNs could correspond to areas which were too rocky to sample --> 0 cysts?  Bruce is checking into this.  Check out the cyst cruise page for more details.

2.  The high values seem to all lie on the 100 m isobath.  I had the isobaths on here before, but MapInfo seems to not put them on the JPEG images.  Grrrr...

3.  There is a value of less than 100 cysts/m^2 in Jeffrey's Basin, which one would expect to be an area of sedimentary accumulation and thus high cyst counts.  ????

4.  There are high and low values in most types of sediments.  Unfortunately this does not provide a quick and easy answer, or at least not to me.

The current cystmap from Charlie

cystmap from charlie

The Casco Bay Maps with Sedimentary Environments

(I suggest opening these in new windows for intercomparison, but I didn't force it to happen.)

Legend
Depth: Top 1 cm
Depth: 2-3 cm
 


Full Western Gulf of Maine Maps with Bottom Sediment Types

(I suggest opening these in new windows for intercomparison, but I didn't force it to happen.)

Legend
Depth: Top 1 cm
Depth: 2-3 cm
 


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Comments to Jason Hyatt
This URL: http://crusty.er.usgs.gov /ecohab/work/cyst_geol.html
Last Modified: Tuesday, 08-Dec-98 08:34:25 EST