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492 REPORT— 1 893. 



Fern Bank, Millport, July 11, 1893. 



Dear Sir, — I have finislied the examination of the clays from the 

 bores at Clava taken at different depths. Very few animal remains 

 were noticed. I have given the proportions of the mud, sand, and 

 gravel that each parcel contained, and the relative proportion of 

 the animal remains, and their names. To save repetition in the follow- 

 ing list, I may state that the proportion of mud is that which passed 

 through a sieve of ninetj-six meshes to the inch, the sand that which 

 passed through a sieve of twenty-four meshes to the inch, and the gravel 

 that which was retained in the same sieve of twenty-four meshes to the 

 inch. I have kept all the materials of each parcel separately, except the 

 muds which passed away in the washing. I have put samples of the 

 sand into small bottles, so that each parcel can be compared with the 

 others. The gravels are parcelled up for the same purpose, so that the 

 different rocks of each can be compared. 



The gravels are mostly water-worn, particularly the larger pieces. 

 No striations were noticed on any of the stones, large or small. 



The term ' floats ' means what is gathered on the surface of the 

 water when the dry clay is put in it and stirred up. In taking the 

 proportions, fractions were omitted or lumped. — Yours very truly, 



David Robertson. 



Bores of Clava Deposit. 



No. 1 Bore. — Depth, 9 feet, ' blue clay ' ; mud, 60 per cent. ; fine sand, 

 24 per cent, ; gravel, 16 per cent. 



Crustacea. 



Order Ostracoda. — Cytheropteron Montrosiense, Brady, Crosskey 

 and Robertson, 



Echinodermata, 



Order Echinoidea. — Echinus spine, sp. (fragment). 

 Spatangus sp. (two whole spines and one fragment) . 



Rhizopoda. 



Order Foraminifera. — Sub-family PolymorphinincB. Polymorphina sp. 

 doubtful (one). 



Sub-family PolijstomelUnce. Nonionina orbicularis, Brady (8) ; No- 

 nionina Boneana, D'Orbigny (2) ; Nonionina depressula, "Walker and Jacob 

 (3) ; Nonionina stelligera, D'Orbigny (1) ; Polystomella ai'ctica, Parker 

 and Jones (4), 



No. 1 Bore. — Depth, 14 to 15 feet ; ' rough gravel and sandy clay * ; 

 mud, 40 per cent. ; sand, 30 per cent. ; gravel, 30 per cent. 



Rhizopoda. 



Order Foraminifera. — Sub-family Ficsulinince. Nonionina orbicularis, 

 Brady (3); Nonionina Boneana, D'Orbigny (1) ; Nonionina depressula, 

 Walker and Jacob (2). 



Sub-family PolystomellincB. — Polystomella striato-punctata, Fichtel 

 and Moll. (2), 



