856 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [April 24, 



figure the venation, which is well marked in several of the speci- 

 mens. The dichotomons division of the frond is not sufficient to 

 justify Prof. M'Coy's transference of this form to Gleichenites, with 

 which in other respects it has no affinity whatever. 

 Loc. Tivoli Coal-mine. 



Cardiocaepttm aitsteale, sp. nov. PL XXVII. fig. 4. 



Fruit cordate, with an acute apex, and a ridge running along one 

 side of the fruit within and parallel to the edge ; seed ovate, acute. 

 Loc. Tivoli Coal-mine. 



With these are fragments of several plants, hut too imperfect 

 to permit their description as new species, or their reference with 

 certainty to known species. Amongst them may be noted a narrow 

 linea Traeniopteroid frond, with ascending dichotomons veins, like 

 Pecopteris (?) salicifolia from India, a Tceniopteris with simple 

 veins passing out at right angles from the midrib, a before notified 

 Pecojjteris allied to F. indica, and a Sphenojateris with linear segments 

 to the pinnae. 



These plants do not supply any additional data to those already 

 known for determining the age of the beds in which they occur, and 

 consequently of the coal associated with them. My investigation 

 of the forms induces me to consider both series of nearly the same 

 age, and to agree with Morris, M'Coy, Bunbuy, and Zigno in the 

 opinion that they belong to the Oolitic period. 



EXPLANATION OF PLATES IX.— XXVII. 



Plate IX. 



Sketch Map of the Geology of Queensland. 



Plate X. 



Fig. 1. Section showing structure of Diorite from Boyne Diggings, Calliope 

 District, Queensland, enlarged 4 times. 



2. Section showing structure of Diorite from Gympie Diggings, Queens- 



land, enlarged 4 times. Analysis given, p. 293. 



3. Section showing structure of Diorite from Granite Creek, Gilbert 



District, Queensland, enlarged 4 times. Analysis given, p. 303. 



*** The general composition of these Diorites consists of triclinic felspar, 

 hornblende, pyrites, and a little chlorite or epidote. It will be noted that the 

 felspar crystals are larger, and the general structure coarser in these intrusive 

 diorites and diabases than in the intrusive Dolerites of PL XII. 



Plate XI. 



Fig. 1. Section showing structure of the Gladstone Trachyte, enlarged 4 times. 

 Analysis given p. 312. 



2. Section showing structure of Porphyrite, enlarged 6 times. Analysis 



given p. 303. 



3. Section showing structure of Quartz-porphyrite from the Berserker 



Eangp, near Eockhampton, Queensland, enlarged 4 times. See p. 303. 



