Table 2 Features of the hardgrounds in the upper part of the Bada Bag Member of the Jaisalmer Formation, Jaisalmer Basin. HG Hardground, S Softground stage, H Hardground stage, r Rare, o Occurring, c Common, a Abundant, + Present, − Absent

(1a) Nav Dungar HG I

Megaripple (obscure)

Ooidal biorudstone

+

Oysters

H: Gastrochaenolites (c)

(1b) Nav Dungar HG II

Flat

Packstone

+

S: Rhizocorallium commune H: Meandropolydora (r), Gastrochaenolites (a)

Terebratulids, rhynchonellids

(2) Jajiya village W (HG II)

Irregular

Packstone

–

S: Thalassinoides suevicus H: Gastrochaenolites (a)

(3a) Jajiya village E (HG I) (Figs. 2a and 4)

Truncated megaripples

Rudstone

–

Oysters (o)

H: Gastrochaenolites (c)

(3b) Jajiya Village E (HG II) (Fig. 4)

Flat, preserved only in megaripple troughs

Fine-grained packstone

–

H: Gastrochaenolites (c)

(4a) Kuldhar Nala (HG I)

Megaripple

Rudstone

–

Oysters (o), Nanogyra patch reefs

Rhynchonellids

(4b) Kuldhar Nala (HG II)

Flat

Fine-grained packstone

–

H: Gastrochaenolites (a)

(5a) Kuldhar River (HG I) (Figs. 2b, c and 5)

Megaripple

Trough cross-bedded sandy ooidal biopackstone to grainstone

+

Liostrea

S: Thalassinoides (c), Siphonichnus, Ophiomorpha (o) H: Gastrochaenolites (o), Meandropolydora (r)

Limids, pectinids, rhynchonellids, terebratulids

(5b) Kuldhar River (HG II) (Fig. 5)

Irregular

Silty biowackestone to biopackstone

+ stromatolitic

S: Chondrites, Rhizocorallium commune, Thalassinoides H: Gastrochaenolites (a), Meandropolydora (o)

Terebratulids, Nanogyra, Chlamys, Homomya, Pholadomya, Pleurotomaria, corals echinoid spines, crinoid ossicles,

(5c) Kuldhar River (HG III) (Fig. 5)

Irregular

Silty, marly, ooid-bearing packstone

+ stromatolitic

Oysters

H: Meandropolydora (o)

Oysters (c), rhynchonellids echinoid spines, crinoid ossicles

(6a) 11 km milestone W of Jaisalmer (HG I)

Uneven, eroded

High-angle cross-bedded rudstone

+

Nanogyra, Liostrea

H: Gastrochaenolites (a)

(6b) 11 km Milestone W of Jaisalmer (HG II) (Fig. 2d)

Irregular

Ooidal biopackstone

+

Oysters

S: Planolites, Rhizocorallium commune

H: Gastrochaenolites (a)

Rhynchonellids, oysters, Ctenostreon, high-spired gastropods

(6c) 11 km milestone W of Jaisalmer (HG III) (Fig. 2e)

Irregular

Packstone with bored pebbles

–

Nanogyra (a)

S: Rhizocorallium commune H: Gastrochaenolites

Oysters, rhynchonellids, echinoid spines, crinoid ossicles

(7a) Gharoi River (HG I)

Flat

Packstone

–

Nanogyra

H: Gastrochaenolites (r)

Actinostreon

(7b) Gharoi River (HG II)

Flat

Packstone

–

H: Gastrochaenolites (a)

(8a) 6 km W of Hadda (HG II)

Flat

Packstone

+

Oysters (r)

H: Gastrochaenolites (a), Meandropolydora (a)

(8b) 6 km W of Hadda (HG III)

Flat

Packstone to rudstone with reworked fine-grained packstone clasts

–

Oysters

H: Gastrochaenolites, Meandropolydora (a)

(9a) Kanod River (HG II)

Flat

Biopackstone

+ stromatolitic

Oysters

H: Gastrochaenolites, Trypanites, Meandropolydora

Brachiopods (r), bivalves (r)

(9b) Kanod River (HG III)

Flat

Packstone to rudstone with bored and encrusted concretions

Oysters

H: Gastrochaenolites