208 BUCKMAN : AMMONITES FROM THE SCARBOROUGH LIMESTONE. 
perfect specimen is possibly Dorsetensia liostraca ; but all these 
identifications must be regarded as provisional. Careful removal 
of the matrix from the last specimen would perhaps enable a more 
positive statement to be made. 
Without taking into account the three specimens last men- 
tioned, there is sufficient evidence for dating with precision the 
Scarborough Limestone, or Grey Oolite as it is sometimes called. 
Lately Dr. Maseke^ has from his researches in North Germany 
di\ ided the deposits of the blagdeni hemera thus : — 
Teloceras zone. 
/Stepheoceras zone. 
Stephanoceras zone. 
Stemmatoceras zone. 
Of tlie s})ecies now dealt with Teloceras coronatum would 
indicate, in my opinion the end of the Stepheoceras zone or the 
beginning of the Teloceras zone, taking Teloceras zone as cor- 
responding with the acme of T. banksi. The species of Stepheoceras 
indicate Stepheoceras or Stephanoceras zone ; but the Skirroceras 
points to something earlier. 
Thus far the Ammonite evidence ; but the species of 
Belemnite figured by Morris and Lycett as B. giganteus (~ B. 
ellipticus. Miller) from the Scarborough Limestone indicates as 
early a date as does the Skirroceras : it may indicate what 
Mascke call Stemmatoceras zone, something rather earlier than the 
true blagdeni zone of Dorset. On this evidence then it may be 
concluded that the deposit known as Scarborough Limestone 
began to be formed Avhen the Stemmatoceras zone was being laid 
doAvn in North Germany, while its ending corresponds with 
about the commencement of the Teloceras zone : there is as yet 
no evidence for anything later. 
A word of warning may be uttered as to specimens which are 
said to have com.e from the Scarborough Limestone. The matrix 
of the so-called Kelloway Rock of the district (= in part, Oxford 
clay of southern localities) is not very dissimilar, and specimens 
supposed to have come from the Scarborough Limestone really 
belong to the much later deposit. 
I Die SteDhanoceras-Verwandteii in den Coronatenschichten von Norddcutschland ; Inaug. 
Diss.; 1907. 
