The higher ground round Wilmcote and Binton is also capped by these Lima beds; but the district is more or less affected by small faults, so that certain beds in one contiguous quarry are absent in another. The lower limestones (insect beds) are largely worked in this locality, and are of much economical value. With the exception of remains of insects and fragments of plants, the fossils are entirely marine, _Ammonites planorbis_ and _A. Johnstoni_, being abundant and characteristic. Crustacea belonging to the genera _Astacus_ and _Eryon_, the latter of great size are not unfrequently met with. Small fishes, _Pholidophorus Stricklandi_, and the larger _Dapedium_ and _Tetragonolepis_ more rarely occur. A fine example of the latter is preserved in the Warwick Museum. The large _Enaliosaurians_ are well represented by some fine specimens of _Ichthyosaurus_ and _Plesiosaurus_; the _P. megacephalus_ in the Museum at Warwick being nearly entire, measuring 14 feet 4 inches in length. Large masses of driftwood and a few fronds of ferns are sometimes met with. But perhaps the most interesting and remarkable fossils are the insects. Twenty-four families and genera were determined more than twenty years ago, since which time many important additions have been made. The _Coleoptera_ and _Neuroptera_ are most numerous. Small beetles are not unfrequently found entire. Among these may be noted the families _Buprestidæ_, _Elateridæ_, _Carabidæ_, and others. There are also remains of _Orthoptera_, _Homoptera_, _Libellulidæ_, and some _Diptera_. Many of the _Neuroptera_ were evidently of gigantic proportions, but most of the insects were of small size, and like the associated plants, are indicative of a temperate climate. They are most nearly allied to forms which now inhabit North America. There are few extinct or unknown genera among them. RHÆTIC SERIES.--The highest beds referred to this series consist of certain hard, fine grained limestones, which, from their ordinary white colour, have been termed _White Lias_. They occupy a considerable area south and south-east of Warwick. They constitute a purely local deposit, and are confined for the most part to this county and Somersetshire. They are often close-grained and hard limestones, and make a useful building material and a good lime. Their colour is mostly white, with a yellow tinge, and occasionally pink and grey. Some geologists consider these beds to belong to the “Rhætic Series,” others to the passage beds between the Lias and the latter, while others still class them with the Lias.