geal ae 
PREBLE COUNTY. 409 
of the members found and reported in the counties to the eastward occur 
here algo, but, for the reason given above, they are not as easily marked. 
The order of occurrence, it will be remembered, is the following: 
5. Cedarville or Guelph limestone. 
Springfield limestone. 
West Union limestone. 
Niagara shale. 
Dayton limestone. 
ew see 
The three lowermost are somewhat obscure, and the third has not been 
positively identified. The Haton building-stone is not, as Dr. Locke sug- 
gested, the equivalent of the Dayton stone, but belongs in No. 4 of the 
above series, representing the building-stone of Springfield and Yellow 
‘Springs. It constitutes the main resource of the northern portions of 
the county. The same courses, together with the overlying Cedarville 
or Guelph beds are also struck at New Paris. The upper beds are here 
burned extensively into lime of the same approved quality which this 
horizon everywhere furnishes in Central and Southern Ohio. The stone 
agrees in its composition, and in all of its characteristics, with the Cedar- 
ville beds, except that portions of it are highly fossiliferous. 
An analysis of the limestone of the Haton quarries has been made for 
the Survey by Prof. Wormley, and is here appended: 
CarHoma tere talline rs ee stan es tant pore ade Mua I ee ANE ae a ee at 49.75 
CarhonaterOiem aon esla sac me steaul ce catia wenniwoe a some ene se cu oan 30.87 
JANI TTONINE, BING, WO, coogas Haas osdo COSA SHO sod oobS dda60 oneha0 Sean 6500 cH0S6" 4.40 
Su CLOUSHUNALTLO Deen eae ee ae a aera wee ee ae ae esa ee Merwe 9.40 
99.42 
The fossil contents of these divisions require no extended mention, 
agreeing, as they do, very closely with the divisions of the same age 
in the counties to the eastward. The well-known shell, Pentamerus 
oblongus, is found in great abundance at Haton, as is also the more 
common of the Niagara trilobites, Calymene Blumenbachit, var. Niagarensis. 
The latter fossil is more abundant here than at any other locality known 
in the State, and occurs in great perfection. The limestone is magnesian 
in character, and consequently all of the fossils are found as casts.* 
A trilobite, new to science, described by Prof. Whitfield in the Paleon- 
*Mr. James Nelson, of Eaton, made the interesting discovery, several years since, of a 
recent insect larva that had occupied the mould of one of these trilobites from which 
_the fossil had been dissolved. The larva had adjusted itself in its growth to the space 
left for it in the deserted mould so accurately as to suggest almost irresistibly, at first 
sight, the idea that we had here the veritable remains of the soft parts of a trilobite. 
The larva belonged to the order of insects termed neuroptera, and probably to the par- 
ticular species corydalis cornutus, which is a common insect in Southern Ohio. 
