306 C. SCHUCHERT^MEDIXA AND CATAILVCT FORMATIONS 



worm burrows, now distorted. S(ineezed, aud slk-keusided. but uoue 

 are of Arthrophycux. Tbese are Palaophycus tortuosum. Then a 

 shaly red saud^stoue, 10 feet thick, followed below by more red sandy 

 shales. 

 Total thickness of Queenstou. exiK)seil and underjtrround. is said to be about 

 IMX) feet. 



Medina, Xeir Yorl\ section ( J^O miles west of Eochrster). — Hall, Geol- 

 ogy of Xew York, Fourth District, 1843, pages 3-l:-5T. 



Clinton. 



Medina formation. At least .■i4 feet, but probably nearer 65 feet. The upper 

 part is to l>e seen in the many quarries alonjr the Erie canal and 

 along Oak Orchard creek, while the lower beds are exposed below 

 Medina Falls, to the west and northwest. 



"Gray band.'' Hall says this is 4 feet thick. The zone from which came 

 the originals of Dictuolitcs hcckii, which are sand fillings in sun- 

 cracks rilled by water. 



A zone estimated to be 8 feet thick, not seen by the writer. 



Tbin-bedded dark red sandstones and a considerable amount of red sandy 

 shales. 8 feet thick. Intraformational conglomerates of shale pebbles 

 are common. Seen along the tow path of the canal. Two feet down 

 occurs a zone 18 to 34 inches thick, made up of the spirals of Dwdalus 

 archimedcs (in the creek above the falls this zone is 30 inches thick 

 and made up of vertical plates only). Arthroithffcus aJUf/haiiirn.'iC 

 occurs throughout the 8 feet. The lowest part of these beds is again 

 seen at the top of the quarries. 



Upper quarry level of thin-bedded red and pinkish sandstones with thin 

 reil shale partings. !."> feet thick. .4. allct/haninisf occurs here also 

 in the upper half. In the lowest beds are found L. cuneata in abun- 

 dance and Modiolop.^iifi rarely. 



Lower quarry level near the falls, of thin-bedded red sandstones with red 

 shale partings, 10 feet thick. Lingula cuneata throughout these beds. 

 In the top of this zone occurs the bulk of the described fauna, as 

 Pterinea (f) primigenia, Modiolopsis ( f) orthonota, PleurotomOri-ia (?) 

 pervetusta. Buranopsis trilohata. and Lsochilina ciiVindrica. 



White sandstones, sometimes slightly tinged with red blotches or faintly 

 pinkish. aV)out 21 feet thick. The upper o feet :;re thinner bedtled. 

 with shale partings, with the sandstones often replete with L. cu- 

 neata. Here also occur Isochilina culindrica. Modiolopsis (?) ortho- 

 nota. Pterinea (f) primigenia, Pleurotomarui (f) pervetusta, and 

 Bucanopsis trilohata, all of which were originally derived fi'om this 

 locality and horizon. The greater central mass (12 feet) is more 

 heavily bedded, with almost no shale (formerly quarried at the falls), 

 while the lower 6 feet of thick beds (in places up to 10 feet) are 

 much cross-bedded, of much coarser sand, with many black or greenish 

 black streaks. All of the lower beds appear to be barren of fossils. 

 Diseonformitii. Base of Siluric. 



Queenston hrick-red shale. Top of Ordovicic ( Richmondian ) . At water-level 

 some distance below the falls. 



