MIDDLE CHALK—ISLE OF WIGHT. 
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Upper Chalk—Rough nodular chalk. ft, in 
/ Seam of light grey marl - - - - - - 0 1 
Hard rough nodular chalk - - - - - 10 0 
Layer of black clay ------- 0 6 
Hard rough nodular chalk - - - - - 8 0 
Hard greyish chalk, with a layer of hard green- 
coated nodules at the top - - - - - 1 2 
Hard white chalk, rough at the top, but mostly in 
massive beds, separated by thin layers of marl ; 
no flints - ----- about 90 0 
/Hard whitish chalk in thinner beds, with many 
fragments and shells of Inoceramus mytiloides; 
Rhynchonella Cuvieri is less common - - 74 0 
(Slialy chalk - - 2 0 
Hard bedded chalk, with layers of yellow-coated 
nodules and seams of greenish marl (Melbourn 
Rock) - -- -- -- -83 
Lower Chalk —Bluish marl (see p. 88). _ 
194 0 
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The Melbourn Rock is well exposed in Mr. Mumm’s quarry west 
of Yarbridge. The general section of this has been given on p. 88, 
and the details of the upper part are as follow 7 : — 
ft. in. 
Hard white bedded chalk, with Inoceramus mytiloides 
and Rhynch. Cuvieri - more than 20 0 
/Hard white rough nodular chalk in regular beds, 
separated by marly partings - - - 5 0 
Rough white nodular chalk in one bed - - 1 6 
Thin seam of greenish laminated marl - - - 0 2 
Hard rough nodular whitish chalk, veined and 
V streaked with greenish-grey - - - 4 6 
Lower Chalk—for details see p. 88 . 190 0 
The highest part of the Terebratulina zone is exposed in a 
quarry half-a-mile west of Yar bridge. The beds seen ere :— 
ft. in. 
Upper Chalk—Rough nodular chalk.14 0 
/Seam of white marl.0 1 
Rough nodular chalk - - - - 8 0 
Middle Seam of black clay - - - - 0 1 
Chalk. \ Rough chalk, passing into smoother - - 8 0 
Layer of green-coated nodules - - 0 1 
Rough nodular chalk - - - -’-26 
'"Smooth chalk - - - - - - 5 6 
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The Melbourn Rock was observed by Mr. Strahan in a pit on 
Mersley Down, north-west of Mersley Lodge, where it is about 
9 feet thick, and is succeeded by 60 feet of hard chalk with marly 
partings, belonging to the zone of Rhynch. Cuvieri. 
A large pit on Arreton Down to the westward exposes the top 
of the Terebratulina zone (18-20 feet) overlain by the nodular chalk 
of the Hoi. planus zone, the succession being like that at Yarbridge, 
but not reaching the chalk with flints when seen in 1887. 
A still better section of the two higher zones is to be seen in a 
quarry near the Convent, east of Carisbrook Castle, where the beds 
are dipping steeply to the north. This has been enlarged since 
1887, and the top of the zone of Rhynch. Cuvieri appears to be 
