=21.= LECOMPTON LIMESTONE. Bennett’s description: “Capping the hills around Lecompton is a five-foot limestone in two layers, which we will provisionally name the ‘Fusulina’ limestone; not that it alone bears that fossil, but because of the abundance of _Fusulina_ in it. It is the lower of another triple system [formation] of limestones, the members of which are separated by a few feet of shale, and which retain this order as far as observed to the west. Above the ‘Fusulina’ stratum are five and one-half feet of clay shales, then one and one-fourth feet of blue limestone, which weathers dark buff, like all its associate strata. Above this are four feet of shales having a bituminous streak in the middle; then ten feet of light gray, easily disintegrated limestone. This group [formation] may be called the Lecompton limestone, on account of their outcropping being near Lecompton. At Spencer, six miles west of Lecompton, the upper part of the series [formation] finally disappears below the alluvial soils of the valley.” From near the horizon of the above formation, from a well in the road in the bed of Deer creek (the one emptying into Wakarusa creek), near the Shawnee-Douglas county line, the following species have been collected: _Fusulina secalica_ (Say). _Campophyllum torquium_ Owen. _Archæocidaris_ cf. _agassizi_ Hall. _Fenestella limbata_ Foerste. _Fenestella limbata remota_ Foerste. _Pinnatopora_ sp. _Polypora distincta_ Ulrich? _Polypora elliptica_ Rogers? It is quite probable that this is a distinct species. It has fenestrules arranged in two intersecting series when viewed on the reverse side, and the branches are not striated. The fenestrules appear nearly square on account of their arrangement, but in reality they are subcircular. On the obverse side the nodes are very prominent and some of them appear to possess acanthopores. _Polypora_ cf. _nodocarinata_ Ulrich. _Rhombopora lepidodendroides_ Meek. _Chonotes granulifer_ Owen. _Productus nebraskensis_ Owen. _Productus pertenuis_ Meek. _Reticularia perplexa_ (McChesney) Schuchert. _Seminula argentia_ (Shepard) Hall. _Spirifer cameratus_ Morton. _Aviculopecten carboniferus_ (Stevens) Meek. _Aviculopecten maccoyi_ Meek and Hayden. _Aviculopecten occidentalis_ (Shumard) White. _Limopteria gibbosa_ (Meek and Worthen). =22.= TECUMSEH SHALES. A stratum of shales about seventy-five feet in thickness, nearly non-fossiliferous, of fine texture, containing abundant ferruginous concretions and occasional layers of soft shaly sandstone. According to Bennett, these may represent the Kanwaka shales.[4]