Friday, 29 March 2019

If the Ediacaran discoid holdfast Aspidella, why not Ediacaran Stalks, Spindles and Fronds in Lanark County?

I’ve now gone through all of the photographs that I took while at the quarry in the period from 2012 to 2014, and identified those that might be stalks, spindles and fronds.   I was at the quarry looking for the trace fossil Climactichnites wilsoni, and specimens exhibiting  microbial mat textures, and photographed whatever else  I saw.  That I photographed a few stalks, spindles and fronds was more by accident than design. 

Below is a cropped version of photograph  Sam 102 that was on my September 2013 blog posting.  There are two circular structures, each with a possible stalk, and one with an adjacent  potential frond.


Below is  the original photograph, Sam 102.  Additional fronds are above and to the left of  the ruler.



Below are photographs Sam 126 and Sam 127, with second being a close up of the first.  There are fronds coming out of each of the three circular discs that are above the ruler.  Interestingly, if the structures coming out of the circular discs are fronds, are the multitude of linear structures to the right of the discs in the first photograph also fronds?  Many appear to be fronds.



 Below is photograph Sam 104.  There might be stalk coming out of the disc.




Below is   photo   ‘Sam 123’.  I mentioned in an earlier posting that it might show a frond above the  4 1/4 and 4 1/2 inch markings on the ruler.


 Below is   a cropped and enlarged version of a photo that I’ve labeled ‘Sam 140Edit’ that appears to show spindles with a medial line in three of the spindles.





Christopher Brett
Ottawa, Ontario


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