Yol. 68. j IX TRE ' FER:MIAN ' KOCKS of 1IAMSTEA.D. 655 



lY. Detailed Descriptioi^ of the RECEisrTLY-DiscovERED Possils of 

 THE Hamstead-Qitarry Series, and Comparison of these 

 Fossils with similar Fossils elsewhere in Britain and 



xVBROAD . 



(1) The Identifiable Species and Varieties. 



All the fossils that I discovered were obtained from the 

 ;N"ew Quarry, but the four sub-groups of the strata present in 

 the Quarry are not all fossiliferous. The majority of the fossils 

 found were procured from the second sub-group (the jSfew-Quarry 

 Marls), and the remainder from the Old-Quarry Sandstone Sub- 

 group. The two sub-groups of the Gravel-pit Sandstone and the 

 Rock-Farm Conglomerate are barren of fossils. 



The organisms include plants, tracks of amphibia and Crustacea, 

 and worm-burrows. All the animals and plants represented by 

 the fossils are of terrestrial habit, and no sign of marine life has 

 been found. Most of the specimens occur in relief on the under 

 surfaces of sandstones in places where those surfaces rest on a 

 marly base, and thus they are casts of the original markings. Yery 

 rarely, however, the actual impression or mould is met with. In 

 such cases the moulds occur on the upper surfaces of fine-grained 

 marly sandstones. 



The fossil plants of the quarry are chiefly in the form of 

 impressions, occurring either on the surface or between the laminae 

 of similar fine-grained argillaceous sandstones. Occasionally they 

 are met with in coarse sandstones — usually red or purple in colour, 

 but sometimes green. 



The beds of marl in the quarries and elsewhere, so far as my 

 investigations have gone, are barren. 



The fossils capable of more or less satisfactory identification are 

 enumerated in the following list : — 



r Walchia [W. piniformis Schloth., W. imhricata 

 PLANTiB. Coniferse ..A (Schimper)]. 



I Cordaites [Artisia Sternberg]. 



(1. Ichiiium sphcBrodactyhim l^Sih&t. 



j la. Ichniotherium cottce Poblig. 



j \h. Ichnium sph(Srodactijlum (nimimicm) Pabst. 



I =1 Ichniotherium cottce {minus) Pohlig. 



2. Ichnium pachydactylum Pabst. 

 2a. Ichnium pachydactylum {minus) Pabst. 

 26 . Ichnium 'pachydactylum {ungiilatum) Pabst. 



=^ Ichnium hrachydactylum Geinitz. 



3. Ichniium brachydactylmn Pabst. 



j 4. Ichnium doUchodactylum Pabst. 

 I 5. Ichnium gampsodactylum Pabst. 



= Saurichnites lacertoides Geinitz. 

 I 5a. Ichnium gampsodactylum {minus) Pabst. 

 ^ 6. Ichnium acrodactylum (1) Pabst. 



r lusecta Wine of insect. 



Arthropoda I ■ rpr Jk3 ^f three species. 



^ 1.1 usucea . . . | ^^^^^^ ^^ entomostraca. 

 Vermes Worm-burrows and castings. 



Amphibia 



or \ Footprints 

 Reptilia 



